my favorite thing about dungeons and dragons is that you can study for it alone, wherever you are, and also the fact that i found an entire database of free resources about 5.0 that are basically all you need to play except for an actual campaign lol
I see your free resources with no campaigns and raise you This
If you’re unfamilar with D&D or want a less complicated version, I recommend Fate. https://fate-srd.com You can print out out the character sheets or just keep them on hand in a PDF / image file. The rules are a bit more fast and loose, but still really fun!