Thank you Thomas.

@javiereguiluz What about removing this entire "note" box? Doctrine is used throughout Symfony docs - no need to mention it each time.

In this article, it's loosely assumed that you're using Doctrine as your database store. But if you're not using Doctrine, it's all very similar. There are only a few parts of this tutorial that really care about "persistence".
If you are using Doctrine, you'll need to add the Doctrine metadata, including the ManyToMany association mapping definition on the Task's tags property.

This article is quite focussed on Doctrine (lots of hacking is needed to make things work properly with the ORM). So I think it makes sense to have this note in this specific document.

Good question! Let's ask to @symfony/team-symfony-docs Thanks!

@wouterj OK. But it doesn't have to be that verbose, so I shortened it: #13439