Decide with method

Online purchase guides

Quick answers, then detailed methods for each step: choose a seller, compare an offer, pay, receive, return, terminate or buy internationally.

Choose a checklist according to your shopping situation · Fill in a comparison grid · Understanding the terms of offers

Daily objects illustrating guides to compare and prepare online purchases
Tips adapted to each product type and step of the order.AI-generated illustration.

How to use these contents

Leave your decision, not a promotion

Choose the guide that matches the current blocking point. Each page starts with a synthetic answer, continues with a checklist and ends with useful sources. You can get a marker in a minute or deepen before an important command.

Find a guide by need

Route 01

Identify shop and seller

Control the field, opinions, promises and actors involved in the sale.

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01

Reliability of a merchant site

Check an online shop

A method of 7 checks to evaluate a merchant site before paying: identity, domain, offer, payment, delivery, returns and reputation.

  • Find a company name, address and consistent means of contact.
  • Control the spelling and apparent seniority of the domain without confusing HTTPS with trust.
  • Read the fees, deadlines, returns and guarantees before opening the payment page.
Read the guide

Check the checklist : Check an online shop

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02

Market places

Buy on a marketplace

Platform, seller, sender: Learn how to distinguish roles on a marketplace and compare an offer before ordering.

  • Open the seller's profile and read its available contact details.
  • Distinguish seller, platform, sender and payment provider.
  • Compare the conditions attached to the precise offer.
Read the guide

Check the checklist : Buy on a marketplace

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09

Second hand between individuals

Buy from a private seller

Announcement, identity, status, payment and delivery: a concrete method to verify and document a second-hand purchase from an individual.

  • Keep the exchanges in the intended course.
  • Require photos and information about the real object.
  • Test essential functions before delivery.
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Check the checklist : Buy between individuals

Route 02

Compare an offer or a contract

Reconciliation of full costs, conditions and services actually included.

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10

Comparison of offers

Compare the total cost

Calculate the real cost of an order by comparing the price delivered, the time, returns, warranty and services included, not just the discount displayed.

  • Compare an identical reference and condition.
  • Add product, delivery, installation and essential options.
  • Valorize the time, return and after-sales service according to his/her need.
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Check the checklist : Compare the total cost

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12

Compare characteristics and costs

Compare prices per kilogram, litre and item

Return small sizes, batches and reloads to the same unit, then check the composition and quantity you will actually use.

  • Express quantities in the same unit.
  • Divide the immediate price by the total quantity.
  • Compare products for the same use.
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Check the checklist : Price per kilo, per litre and per piece: compare the lots

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15

Recurrent services

Compare and cancel a subscription

Free trial, engagement, renewal and termination: calculate the cost over time, keep confirmations and check the last draw.

  • Calculate the cost over the intended duration of use.
  • Identify engagement, renewal and notice.
  • Check the termination function before signing up.
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Check the checklist : Compare and terminate a subscription

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17

Telecommunications and subscriptions

Compare mobile and broadband plans

Coverage, eligibility, debit, price after promotion, commitment and equipment: compare a telecom offer according to your address and usage.

  • Test coverage and eligibility for use.
  • Dimension data, debit and useful services.
  • Calculate the cost after promotion and with the fees.
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Check the checklist : Compare a package or a box

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22

Compare characteristics and costs

Renting: check a listing and prepare your application

Compare adverts, monthly costs, contact person identity and useful documents before applying for the rental.

  • Compare the monthly cost and the same characteristics.
  • Confirm the contact person before forwarding a file or payment.
  • Limit documentation to authorized and necessary supporting documentation.
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Check the checklist : Rental : check an advertisement and prepare its file

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23

Compare characteristics and costs

Services: compare quotes and scope

Describe the need, deliverables, costs, timelines and amendment procedure for comparing benefits.

  • Provide each claimant with the same briefing.
  • Compare perimeter line by line.
  • Obtain a written agreement for perimeter deviations.
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Check the checklist : Service Delivery : compare estimate and scope

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25

Professional procurement

Choose business SaaS software

Compare functions, cost per user, limits, contract, security and data export before you subscribe to professional software online.

  • Test three concrete scenarios with fictitious data.
  • Calculate the team's annual total.
  • Formalize data responsibilities.
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Check the checklist : Choose a professional SaaS software

Route 03

Choose by product

Check the characteristics that change depending on use, security or delivery.

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28

Second hand

Second-hand or refurbished

Condition, battery, accessories, warranty and seller: a convenient checklist to compare a used or reconditioned product before purchase.

  • Read the definition of the grade specific to each seller.
  • Identify the professional or special status of the seller.
  • Check battery, accessories, compatibility and locking.
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Check the checklist : Used or reconditioned

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29

Before a new purchase

Repair or replace an appliance

A method for comparing diagnostic, repair estimate, new or reconditioned replacement, cost of use and life uncertainty.

  • Describe the symptom and keep the exact reference.
  • Ask for a quote that separates diagnostics, parts, labour and transport.
  • Compare the same service over the same duration.
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Check the checklist : Repair or replace a device

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31

DIY and garden

Compatible tools and batteries

Compare a tool alone and a complete kit by checking platform, voltage, battery references, charger, weight and accessories necessary for work.

  • Remove platform and references of all elements.
  • Do not confuse same tension and compatibility.
  • Add battery, charger and accessories missing from the kit.
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Check the checklist : Compatible tools and batteries

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35

Home and bulky-item delivery

Plan a furniture purchase

Measurements, parcels, access, delivery, assembly and return: prepare the purchase of a piece of furniture before validating a large order.

  • Measure the furniture, packages, access route and space needed in use.
  • Identify the exact delivery service included.
  • Read the assembly, old-furniture collection and return terms before paying.
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Check the checklist : Prepare to buy a piece of furniture

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36

Windows and home textiles

Measure and compare curtains

Measure from the intended fixing, count panels and compare fabric, hanging method, alterations and care before ordering curtains online.

  • Measure from the chosen hanging system.
  • Distinguish one-panel dimensions from pair dimensions.
  • Add necessary brackets, accessories and alterations.
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Check the checklist : Measure and compare curtains

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39

Compare characteristics and costs

Flower delivery: bouquet, date and recipient

Compare the bouquet size, flowers, substitutions, accessories and the discount date before ordering.

  • Compare the composition and size chosen.
  • Check the date for the actual address.
  • Prepare the delivery to the recipient.
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Check the checklist : Flowers delivered : compare bouquet, date and recipient

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45

Compare characteristics and costs

USB-C chargers and cables: check compatible features

Compare the power, ports, load sharing, cable length, and data or video functions required.

  • See the features of the appliance before the accessories.
  • Read the power sharing table, not just the facade value.
  • Do not deduce the functions of the USB-C form alone.
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Check the checklist : Charger and USB-C cable: check compatible functions

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46

Compare characteristics and costs

Printers: consumable compatibility and cost per page

Compare the cartridges, advertised yields, useful functions and recurring costs before choosing a printer.

  • Compare devices for the same volume and documents.
  • Check consumables with the exact model.
  • Keep the same method of return between offers.
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Check the checklist : Printer: consumables compatibility and cost per page

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47

Home equipment

Appliances and running costs

Compare the capacity, consumption, noise, installation and maintenance of your household appliances with an example of how to calculate the cost of use.

  • Compare close useful capabilities.
  • Read unit: annual consumption or by number of cycles.
  • Add delivery, connection and possible accessories.
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Check the checklist : Appliances and cost of use

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52

Home Internet

Improve your home Wi-Fi

Distinguish internet and Wi-Fi coverage, compare measurements per room and choose a repeater or a suitable network after the first checks.

  • Distinguish internet connection and indoor network.
  • Measure several parts under the same conditions.
  • Optimize the location before purchasing.
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Check the checklist : Improving the Wi-Fi of housing

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53

Small appliances

Compare coffee machines

Compare a coffee machine according to the drinks, cost of consumables, congestion, cleaning and maintenance instructions of the model.

  • Count the beverages and recipes actually used.
  • Measure access to the tank and removable components.
  • Calculate consumables and accessories over a common period.
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Check the checklist : Compare a coffee machine

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54

Maintenance of the house

Choose a suitable vacuum cleaner

Compare the vacuum cleaners according to your floors, stairs, accessories included, handling, consumables and maintenance instructions of the model.

  • Inventory soil and obstacles.
  • Compare the accessories of the reference sold.
  • Test handling, emptying and storage.
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Check the checklist : Choose a suitable vacuum cleaner

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56

Bedding and room

Compare mattresses and trial periods

Check dimensions, spring compatibility, delivery access and test conditions before buying a mattress, without confusing comfort and health promise.

  • Measure the bed and identify the bed frame.
  • Read the mattress support conditions.
  • Prepare delivery and old bedding.
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Check the checklist : Compare a mattress and its test

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57

Books and reading

Choose the right book edition

Identify the edition, language and format of a book before purchase, then compare availability, used status, delivery costs and withdrawal.

  • Keep the exact bibliographic reference.
  • Distinguish language, translation and format.
  • Read the status and exclusions of the occasion.
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Check the checklist : Choose the right edition of a book

Route 04

Travel, plants, audio and games

Concrete methods for comparing formats, compatibilitys and conditions of use.

Route 05

Pay, receive and solve a problem

Secure the route, keep the evidence and know what to check after the order.

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65

When to pay

Pay securely online

Payment Page, Authentication, Beneficiary and Recourse: A method to limit risk and retain useful evidence.

  • Access payment from the official route.
  • Read seller, currency, delivery and total before validation.
  • Never communicate an authentication code to a third party.
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Check the checklist : Secure payment online

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67

Order receipt

Resolve a delivery problem

Promised date, follow-up, reservation, unreceived package: organize the evidence, formulate a clear timeline and send the request to the right contact.

  • Keep the date or deadline promised.
  • Address the seller for the proper execution of the order.
  • Photograph packages, labels and contents in case of damage.
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Check the checklist : Manage a delivery problem

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68

After order

Prepare a return

Cancellation, non-compliant product, damaged package: Identify the right step, keep the evidence and follow your refund.

  • Qualify the problem before choosing the approach.
  • Notify the seller by a written date.
  • Photograph the product, package and label if necessary.
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Check the checklist : Prepare a return

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69

Defective product

Make a warranty claim

Default, proof of purchase, repair, replacement and commercial warranty: arrange a clear request with the right contact person.

  • First address the professional seller for compliance.
  • Distinguish legal guarantee, commercial guarantee and SAV.
  • Describe the defect with proportionate evidence.
Read the guide

Check the checklist : Play a guarantee

Need an overview?

The four-step shopping route

The general shopping guide links verification, comparison, marketplace and retention of proofs in a single method.

See the complete method

Frequently Asked Questions

About the guides

Which guide to start before a first purchase?

Start with the store check, then use the total cost comparison guide to split the selected offers.

Do the guides recommend merchants?

No. They provide independent decision-making criteria and refer to the directory to discover several actors without establishing a commercial ranking.

Do legal information replace personalized advice?

No. The pages explain general benchmarks and refer to current public sources to verify the rules applicable to a specific situation.