You can find information in your car owner's manual, on the product packaging, on type lists in specialist shops and by measuring yourself.
It is usually sufficient if you know the designation of your car. Most windscreen wiper packaging indicates which car brands they are compatible with.
In addition, most specialist dealers and DIY stores have type lists with which you can easily find out which wiper blades you need.
As with all questions about your car, it is usually worth taking a look at your car's owner's manual. Since this is often a little time-consuming, we recommend that you simply remove your current windscreen blades and take them with you to the DIY store as a sample.
The staff will be happy to dispose of them and help you to fit them if necessary.