Video help

Where can I get help from someone to tutor me on how to use this program in the simplest sense?  All I want to do is make narrations with a single screen capture in the background and insert clips to comentate on.  I have months and months trying to find someon IRL or tutorials online and can find nothing that specific.  Everything is way too advanced for what I want to do, the tutorials within the program show me nothing on how to do this.