The most valuable and misunderstood tutorial is to copy good art. Good art is the result of most things being done right and very few things being done wrong, by copying it you're absorbing that information.
You just have to avoid doing it too much because it may become a habit to simply brainlessly copy without learning anything. First fill your brain with the right information by copying good art, then try to apply that knowledge by drawing on your own, then copy stuff again to refresh your mental model of how good art works, and keep going back and forth like that.