Mini French Bulldog

I'm working on systematizing my knowledge on developing and supporting small projects and realized I need a single, reliable resource where everything is clearly explained and presented without unnecessary fluff. I especially appreciate websites that make complex processes understandable in simple terms. I've encountered similar resources in the past, but I can't find anything similar now. I'd be grateful if someone could suggest a resource like this—one that would allow me to study without wasting hours searching for scattered information.