Came to post the same thing. Don't get too hung up on the actual database, just learn SQL and relational databases. It's something you will use over and over a

Came to post the same thing. Don't get too hung up on the actual database, just learn SQL and relational databases. It's something you will use over and over again, even if it's just to peek into the back end to see what your framework, ORM, etc actually did with the data.