Using mostly only "neighbour" notes - no no weird scales or anything like that. For example, to play note A we add note G# before, or Bb, depending of situation.

Simply use your thumb to brush these octaves but be sure to have proper left hand muting, you might have some unwanted notes otherwise. Playing octaves is a fairly easy way to get a powerful sound from your guitar.

A faster swing solo using D major scale, neighbour notes, and some "out of scale" notes.

It's time to play solos over a jazzy swing backing track.

Using common notes between two chords belonging to different scales to allow a smooth passing between them when improvising in the blues and dorian modes.

There are two kinds of approximation and they are both chromatic, the approach above and the approach below the note that is considered the melody.

My thought process when targeting the "right notes" in a fusion context.

Only using two strings and very basic shapes!

Practice timing and playing 16th notes using interactive exercises.