So in my first year in the university doing my undergrad, i realized that studying wasn't coming to me as easy as it did in Senior High School and i had to literally put in more effort to remember what i want to remember for the purposes of education and examination and that was when i enrolled myself in a course on coursera : Learning How to Learn, that was when i came across the memory theories you just described and i must say it was a life saver. I recommend it to anyone reading this who would love to understand how the brain works when it comes to learning