For folks who have successfully gotten offer from FAANG or other high profile companies, do you mind sharing your experience and tips of leveraging the gr0k king system design interview course?
After reading few design topics there, I feel like just preparing from there won't be enough to get into those top companies, some of explanations there also seems incomplete.

Did you guys take some parts from there, some parts from watching youtube videos, and some parts from reading engineering blog, and then combine them into your own easy-to-understand notes? That's what I am currently thinking, but that will take a lot of time.
I know each person has different learning style, but sometimes it may be helpful to know how other successful people went thru the process, which I'll try to emulate and adjust. Thank you!