Memorize on what you've read so far to ensure total remembrance on the information contained in your brain.

True, but it is still better if you also get familiarized and fully comprehended your lessons by watching tutorials as you mentioned. For example, memorization is not the only key to pass to survive in our major subject, which is accounting. Being familiar with the practice use of accounting formulas is better than memorizing it alone. That's what I learned after seeing my friend struggled in accounting because she didn't understand the whole concept🥲