First of all, welcome here, it was a good introductory show. 

You mentioned four topics that would be interesting to a lot of listeners

Web development/Coding
Mathematics
Music Theory
Electronics pertaining to computer repair

On Music theory, I would also like to hear more.  As a child of 12 years, I did play the piano, but did not go far with it.  With that I can still play a few notes.

With electronics, less of my experience is in computer repair.  More of this is repairing electronics in a factory setting, although knowledge here is not what it could be.

Maybe not you but another host might like to do one on Arduino.  Again, limited experience here, but this would be an interesting avenue to explore.

Archer72