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The tool you use isn't important.
The way you learn is also unimportant.
You need to understand logic, and how the parts of the programming puzzles go together.
Read through all that you have, and be sure to reread when you don't understand each chapter.
Post-crash, I assume you've got a lot of time on your hands, as you recouperate.
It takes time to learn all the ins and out of coding, but reading and understanding all the important bits is good to get into it.
Good ways to cram it in, as with most learning, is with pen and paper in hand. Read a chapter, jot down notes, and hopefully they'll stick in your head.
Feel free to open Unity, or whatever language, at any point. But don't do simple "copy and paste" stuff if you truly want to "learn".
Try your best to write everything yourself.
Challenge yourself to a little quiz at the end of a chapter.
Keep scribbling ideas and thoughts with your pen and paper.
That's, realistically, the only way to actually learn these things.