I'm 18 years old and I'm soon getting a keyboard because I'm really interested in music. I am especially interested in composing my own music and learning a lot of music theory. I used to play the guitar a couple of years back and I quit because I couldn't stand learning songs/techniques... But now I'm starting fresh, and I want to be able to write/read/think in music.
Where do you recommend I start? Is there any book/website/YT series/etc. that you think can help me learn theory and music compositions? Do you have any tips for me?
Oh and I have a number of music software that accept MIDI or allow me to write notation. But are there ones that you really recommend?