u/Expensive_Ad_9888

Can someone tell me the best way to download files and where from? I bought one off a friend because he didn't know how to use it had a bunch of regular play store phone apps and then it had fortnite which I was pumped about but it has San Andreas (which won't launch) it has a few emulators that the games work (cpl from N64) but all the GameCube files won't respond to gamepad or touchscreen, just wondering if I could get some advice. Thanks in advance.