Find a small project that you're interested in and check out the developmental discussion channels to see if there's any way you can lend a hand. Starting with

Find a small project that you're interested in and check out the developmental discussion channels to see if there's any way you can lend a hand. Starting with trying to find complex coding tasks in large bureaucratic projects is setting yourself up for failure IMO. For example, https://zynaddsubfx.sourceforge.io/contribute.html https://zynaddsubfx.sourceforge.io/contribute.html shows a few different levels of involvement in one project I maintain. That's not me saying you should work on this project specifically though; you'll want to find projects that you're enthusiastic to learn about.