Welcome @MBA00!
Your questions cover a lot of ground, so here are some good forum posts and resources that go into details on these specific topics:
Hope this helps! If your curious about something more specifically, please ask!
##Book memorization
- Blog: How to Memorize a Book
- How memorize BOOKS, where take so many loci?
- Best method to memorize a textbook?
- Seeking Advice on My Strategy for Memorizing and Understanding a Physics Textbook
##Reusing memory palaces
##Creating and finding more palaces
- https://artofmemory.com/wiki/Getting_Started
- Add to the (big) List: Location ideas & inspiration for Memory Palace Places.
##Memorizing computer commands
In this case you may be interested in my experiments with this specific topic, which I document here: