Mostly good info in there, but I see a few problems:
> There is also no E#. It just doesn't exist. Get used to it. Those are the 12 notes.
Technically not true. There is an E#, it's called F. If you are playing in F# major[1], the scale has an E# in it.
> Musicians never play notes one at a time. They always use chords.
Most lead guitar parts are not chords. Typically playing in a band context will create a chord from multiple instruments, but that isn't always the case.
> There is also no E#. It just doesn't exist. Get used to it. Those are the 12 notes.
Technically not true. There is an E#, it's called F. If you are playing in F# major[1], the scale has an E# in it.
> Musicians never play notes one at a time. They always use chords.
Most lead guitar parts are not chords. Typically playing in a band context will create a chord from multiple instruments, but that isn't always the case.
[1] https://en.wikipedia.org/wiki/F-sharp_major