Kek.
So, I've watched a few videos, and I notice a common (and probably basic, such a noob am I) approach tool in the form of wl/wd -> jab/f-tilt/grab. I can do it, yet never do because I have more confidence in spacing aerials than approaching on the ground (as in, I don't have the balls to get in my opponent's face). Should I implement this with frequency (against spacies, floaties, shiek, etc.) or as a mixup?
Aerials aren't really a good approach tool. Fair is super slow and easy to avoid, so I'd shy away from fair as an approach tool. You can catch your opponent with bad spacing by throwing out a delayed fair (don't fast fall it), but it's situational. You can approach pretty well with bair (waveland --> bair) and then pressure with jabs / tilts, but that's really the only aerial approach option that's legitimate. Same goes for auto cancelled up airs, but those aren't as easy to space as bairs, and approaching with an up air is pretty punishable.
Retreating up air / fair are much, much safer than approaching with them.
Good approach tools:
1) waveland in. Opponents like to dash dance when they expect you to fair. If you SH then waveland in --> tilt / jab / grab, you can usually catch them with bad spacing.
2) Run in and crouch (low %). A lot of the time, players get scared of ganon and want to try and attack him before he gets too close. Since ganon is slow and his moves are slow, this is a pretty good option. Unless you can crouch cancel. Free jab and sometimes grab. Easy $$.
3) Dash attack (seriously). Similar to marth / sheik, your dash attack is actually very good at stuffing dash dancing opponents (just like option 1, but it's a little quicker).
These ARE legitimate mixups, but really, they only work in limited situations, so use them sparingly. They're only one step away from being gimmicks.
Controlling center stage and forcing your opponent into a corner as ganon is IMO much more important than how you decide to approach. Walling out with up airs and tilts when they're in a corner is going to be your bread and butter as ganon.
Baiting them in and punishing is much more effective when you're playing ganon (think: marth).
One more thing that would have helped me immensely when I was first playing: learn to love the corner. The obvious temptation you're going to have when in the corner is to try and get back to center stage, but ganon is slow. But here's the nice thing about ganon's bair- it's big as **** and it's also really fast (frame 7, if I'm not mistaken). You don't even have to retreat the aerial because of its speed. If your opponent is coming at you from the center, stay patient. Bair, tilt, jab, and jump away until it's safe to go in. Be patient.
And if all else fails, go to the edge, waveland in with invincibility, and buffer a roll in lol. Pretty damn safe option and they'll have to read the roll to punish you.
That's a short (yes, short) list of some of the ganon fundamentals that took me 3+ years to learn lol. Hope it helps.