Database integration help?

Can someone offer some time on how to develop an application A-Z and how this works? Currently in school, almost done with my 2 year and really haven't learned the "real world" of development. I'd like to try and build a program for a portfolio, but would like it to include database stuff, api and essentially turn the code into a downloadable file. Currently running a macbook pro, eclipse IDE configured for C++. Open to databases and what not. I just don't even have the first clue on how to integrate a database into all of this. Help! Open to Zoom meeting or something! I just really want some help so I can move forward so I'm not just some new guy when I get a job that doesn't know anything.
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