I took lessons for 9 years as a kid and forgot a lot of shit, actually pretty sad. Now, I remember chords, inversions, and picked up a sound for music though. My advice would be to just learn simple chords and you'll grow from there. Check and see if youtube has tutorials for some of your favorite tracks; that's always pretty fun. I used to try and learn songs from like N.E.R.D. and Outkast in high school. Pretty cool