Answer 1

You must start somewhere, don't worry. At first there's no way you can remember all the syntax and details. But the more you will write some code, trying to build some small jobs by yourself, the more you'll remember.
I suggest that when you need to copy some part of codes for your projects, don't copy/paste, but rewrite it. that's when you'll learn and paste it in your brains !
Try the challenges on sololearn, they are very good to practice.
Try to use the code playground as often as you can, trying to modify the lesson examples and check what happens.
And writing a code after each lesson to recap what you learn is the best way !