I'd like to see a lesson taking up the theory of how to write a melody with accompaning harmony and bassline and play it fingerstyle or with a pick+fingers. Stuff like how to know where on the neck you can find notes that work harmonically with the note you're using for the main melody, depending on the key you're in, and how to position your fingers/thumb to be able to play everything at once. I'm guessing this is kind of advanced but hey, no harm in asking!

Just find the key it's in and play around with those notes. You'll pick out a few and be able to harmonize.