A lot of Python, a lot of SQL, some Bash, some JavaScript, some HTML, learning Zig and C.
Languages aren't important. Algorithms, concepts, and user experience are important.
I keep it private. Software development should not be a spectator sport. Feel free to look at my repos and my gists, however!
You probably can't, sorry. If there's an issue with a project raise an issue in the repo or follow the instructions on the relevant support page.