Just "start doing it" and quickly you'll run into a wall, ask for help with a legitimate question that isn't vague like "teach me about x". Solve that problem

Just "start doing it" and quickly you'll run into a wall, ask for help with a legitimate question that isn't vague like "teach me about x". Solve that problem and move onto the next. Via a string of problem fixes you gain more domain knowledge and you'll retain more as you struggled through it and deeply understood it.