From Redditor dylloop95:
General
- Sell Fusion Cores to traders before they run out, you will get much more for a partially charged core, over an empty core.
- Pickpocket enemies with power armor to steal their Fusion Cores, this will cause them to leave the armor, and you can steal the frame
- The Lone Wanderer perk still provides bonuses with Dog Meat as a companion
- When Leaving your power armor remove the Fusion Core so no one will decide to use it.
Full text here.
There’s also a resource list, courtesy of Redditor sgtpepper901, in case you need more crafting components.