How do i get the most out of these videos? This is a lot of information to retain? How do I learn and retain this info.

The best way is always to make a project at your own. Make a little site about something you are interested in and use the stuff you learned. Also write a lot of comments for yourself. So you can look at you project after some month and read in the comments what the element is doing and why your are useing it.

You will forget a lot of stuff when you dont practice it. Learn some javascript next so you can upgrade your project... And also try something you dont learned in the videos...look at css websites and look for some stuff you might want to try. Try to increase your knowledge by practicing/learning new stuff.

It is like learning a normal language...you will only speak fluent when you use the language consistently

Repetition. Practice. Watch video again try to understand the concept. Then apply the concept to solve a problem. Or try to apply the concept to solve a problem.

You only to know enough to solve problems.

I would suggest possibly getting a codepen account. The basic one is free and will give you a playground where you can test what you've learned and code at will. It supports HTML, CSS, and JavaScript. I have even been known to do some coding on codepen from my iPad, so it's possible to sit in a waiting room and develop a website!

Learn the basic concepts and try to understand how to implement them in a design. I don't believe that you should try retain all this information. I know that I haven't!

If you need a quick reference use something like MDN (Mozilla Developer Network) https://developer.mozilla.org/en-US/

sublimetext and emmet.

http://docs.emmet.io/cheat-sheet/

That's about it.