I started with Bushcraft 101 and SAS Survival Handbook. There's an app from the US military for Rangers that's free, but I chose a book since app and electricity won't be available when needed.
I also follow quite a few survival channels which show building an entire homestead from scratch. I've not found a single source, but by piecing together many techniques, I know the basics of a building good shelter, fire creation, sourcing water and food all the way up to building a water wheel for lumber and grain processing.
I'm no expert, but I believe I am reasonably capable of getting shelter, fire, food, and water as I at least know the concepts and techniques.