Depends on what I'm trying to learn. If it's a programming language, or something math-heavy, I prefer books. If it's GUI programming, I prefer videos. I tried

Depends on what I'm trying to learn. If it's a programming language, or something math-heavy, I prefer books. If it's GUI programming, I prefer videos. I tried learning Android programming from their official documentation, and felt lost with all those hyperlinks that made a horrible directed multicyclic graph. I did not consider books for this because it's a fast-moving target. I learnt python entirely from their official documentation.