I taught myself this. What did I skip?

I taught myself , mostly by . I use it for . Learning this way leaves gaps I can’t see, because nobody set the order. Ask me up to six questions, one at a time, that would expose them: some on how I’d do a task, some on why a thing works. Hold your verdict on each answer until the end. Then give me a short table: each gap you found, how much it matters for what I use the skill for, and the quickest way to close it. Separate the gaps my answers showed from the ones you only assume are common. Don’t flatter me: if an answer was weak, say so. Be direct. No padding and no reassurance I did not ask for.