Lots of great advice here. I'll 2nd the YouTube as a resource. I've repaired AC units, a garbage disposal, and replaced the damn water heater all from an hour or 2 of research and watching YouTube.

Also keep a note book that you jot down the seldom done stuff, like blowing out sprinklers, which furnace filter size you need, etc.

Anything you buy for home improvement, from new cabinet handles to drywall, get an emailed receipt and put it in a special folder/tag that you can find again when you sell. Those dollars spent are tax deductible when you sell your house.

Builder's grade = cheapest shit they can buy in bulk.

Enjoy your new house!