Whether from a book, a YouTube channel, or a website...pick a grow style and stick with it. Everything can work, but it doesn't all work well together. There is a ton of conflicting information out there. Find someone who grows gardens you'd want as your own, and who is a good teacher. Do what they do. If you like to learn from videos, here are some good sources on YouTube.
Amended soil, synthetic nutes: Welcome to the Growtent
Organic: Build-a-Soil, Mr. Canucks
Coco coir and synthetic nutes: Dr MJ Coco (He has some YT content, but his website, Coco for Cannabis, has more.)
Autoflowers: Bill Ward
Some of these have "seed to harvest" videos that outline their whole approach.
Hope that helps.