The absolute BEST advice I can give is… learn HTML5. It will take 1 day.
HTML5 takes more than one day to learn unless you’re talking about the very very basics.
If I can give any advice or help, Jessica Hische along with her husband, made a series of videos to help people in print. It’s called Don’t Fear the Internet which explains HTML and CSS to the point that a 1st grade student could understand. Honestly, I’m betting most people have learned by just diving in and researching problems as they go along.