Thanks!

1. it took hours to figure out how to correctly install Android Studio and get it to compile. Including completely starting again; installing extra packages and accepting that some errors will exist.

eventually most of the hello world app was a sample program; so I didn't really write it; just worked out how each part went together and how the files were stored in the weird app-code-files folders.

1. I will be making test programs along the way hopefully. Thanks

Not a game; shouldn't have to worry about it.

Will ask if I need. Thanks!