The only editing you really need to master to make "business DIY quality" videos is… 1.) cut video segments to remove deadtime, 2.) merge two video segments together and 3.) overlay simple text.
Practice on something fun before you need it for work. Your kids, your dog, your garden, etc. Something you love and won't get sick of looking at, LOL! This was my “practice” using a complicated program and every damn possible effect.