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→Muting
Something that always gets glossed over is muting. '''Just as important as being able to create sound is being able to mute it'''. Guitar strings will naturally convert any energy they encounter into resonance. That means any bump to the guitar, even things as slight as fretting or bumping a string, will induce audible resonance in other strings. Even sound waves hitting the strings will induce vibrations, which is particularly evident on cranked up electric guitars in the form of feedback.
Muting is performed with both hands for maximum effectiveness. '''The left hand should lay multiple fingers flat across all the strings, using enough pressure to dampen vibrations without using enough pressure to push any of the strings against the frets. The right hand should rest the side part of its palm near the pinky against the strings - again just enough to dampen the strings from vibrating.''' The further away from the bridge and nut you touch the strings, the greater the chance of success; however, it is impractical to move your right hand too far from the bridge. And it's probably excessive to move your left hand away from the location of the notes you want to play.
Unless strumming full chords, there's likely going to be some string you don't want to ring out while you are playing. I like to use my right palm to mute the thicker strings "above" the one(s) I'm playing and my left index finger (even if that's (one of) the finger(s) I'm using to fret) to mute all the thinner strings "below" the one(s) I'm playing. This doesn't need to be perfect - just enough to get the job done. And it's not worth trying to get it right off the bat. We'll talk more about it as we go along.