If you're a bit motivated, I recommend PostgreSQL. I had never used it before, but in two days, I managed to use it correctly on a real project! Here's what I did:

Start with SQL using this video: https://www.youtube.com/watch?v=HXV3zeQKqGY&t=2611s

Then PostgreSQL: https://www.youtube.com/watch?v=qw--VYLpxG4

And for using it in production, here's Supabase and a tutorial to get started with PostgreSQL: https://www.youtube.com/watch?v=dU7GwCOgvNY

That's 10 hours of video, and thanks to that, as a beginner, I managed to create a database for a site with 10,000 users per month. Good luck!

JSON files

Sqlite is very good.

Not an "Ask HN", flagged