There are no best harmonics.
Guitar. Tuning forks are a sine wave
A rythym guitar is an electric or accoustic guitar playing chords to keep rythym and the bass guitar is used to anchor down the harmonics and lay down the beat, basically smooth things out and either playing basic rythyms or beautiful harmonics.
Great question! I'm VERY partial to my Epiphone Les Paul Goth. Mahogany body, hot pickups. Great harmonics and sub tones. Look for a guitar with a thicker body. Most inexpensive guitars skimp on the body materials so it may be better to spend your $$ on something used but higher quality.
He is well known for tap harmonics. This is most famously known in his guitar solo in his song Eruption. This technique is more commonly seen in the David Lee Roth era.
Those are called pinch harmonics.
A guitar is a far more complex structure than a tuning fork, and has more harmonics. The whole design of a tuning fork is intended to give as simple and pure a sound as possible, since that is the easiest type of sound to use when you are trying to tune an instrument. You wouldn't want harmonics in a tuning fork.
Artificial harmonics, tapping,and arpeggios are good to learn.
This depends on what type of guitar you are using. If you are using an acoustic guitar then reshaping will harm the sound. If you are using an electric guitar it will not, but you must have the strings set to the same tension after you have reshaped it.
Musiciansfriend.com or Guitarcenter.com. Be careful when choosing, though. If you are at all serious, at least look for one with high-output pickups (humbuckers). If you are interested in pinch harmonics, you will have to have these.
Pipe organ has the most harmonics.
the sound produced by a guitar string: the fundamental wave is a standing wave (its harmonics too).
Perhaps, but it takes a lot of things to get it to happen. It will depend on the amplification, volume, actual notes and the harmonics of the glass in question.