#1
as it says, how do you do a pinch harmonic, cause I never really cared how to play one, but IDK, I should learn it cause I am a guitarist so yea.
#2
My friend describes it as grazing your thumb on the string as you pick.
Quote by HuckIt
I met this chick I really liked and wanted to practice sex, so I practiced on some guy I met at a gas station...
#3
theres a pickngrin lesson this. but a quick summary:
Take ur thumb on ur picking hand and let it stick out a little from the bottom of ur pick. Fret a note, try on the G string first. Pick the note, and it should come off with an odd sound. Try picking over the Neck pickup for a higher squeal.

Use search bar next time. there must be dozens of threads on this.
#4
pick and let the tip of your thumb hit the string slightly enough to leave it with that high pitched squealing sound.
#5
Hold the pick with the side of your thumb at the very tip of the pick, and then make a scooping motion with your picking hand as you hit it. Make sure to add vibrato, it sounds way better.