Hi @Stéphanie ,
Welcome to the community!
You can create a personal Team for your personal boards.
You can create multiple Teams in case you require more than 10 boards.
You can create multiple Teams with Trello's free plan!
Also, you can have a look at these articles/documentations
No, now to make a personal board you should create a team, where only you are.
It has been a change of the conditions of use of trello
Look at this post:
Anyway, personal boards are limited to 10, if you need to create unlimited boards, you must have the premium account
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