Well, it actually depends on the good Ganon. Some Ganons will try to take laser hits and jab you after them, or counter your approaches with aerials OOS, etc. Some Ganons will just try to space Fairs hardcore so that you feel like you can't move, and some Ganons use lots of platforms to drop through with aerials to avoid lasers.
Dealing with all of this:
Lasers shut Ganons down. If they try to jab you after the laser hits, then you Nair/Fsmash(hilarious btw) them, or laser more. If they get to higher ground to avoid your lasers, then you should use higher lasers to hit them/position yourself to laser them when they fall or punish in some other way. You also want to laser Fair-happy Ganons so they can't move around and keep their big hitboxes out. Lasers ****.
If you get hit by Ganon, you can die pretty easily, so plan your attacks well. When you get a shine/uptilt, make the most of it with shines and Dairs at lower percents, and uptilts and Dairs at mid percents, and Dair tech chases to Dsmashes/Fsmashes(position dependent) at mid-higher percents.
That should do for now, I guess. I'll write a Ganon matchup eventually......lol.