Is this application legitimate to start programming or do you need more basic stuff

Answer 1

you don‘t need more basic stuff, this application teaches the basics

Answer 2

yes it's a good start but you will need other resources for more advanced stuff

Answer 3

you can start here with nothing or you can start after learned the basics, here you will learn basics tuturials, and if you want, you can advance to some advanced tuturials. It's your decision.