I’m going to be DMing Storm King’s Thunder soon, but only with 3 PCs

My wife says I have to throw out some of the old D&D books…

UA Fighters: seem like they could apply to other classes as well. Thoughts?

How much shoul cold weather gear cost?

Any tips for a first time Curse of Strahd DM?

UA Knight: What the thinking behind limiting implacable mark?