Being humans, we rarely learn things linearly.
Instead we all cobble together a good-enough understanding, leaving holes here and there to fill in later.
It's fine. Stuff mostly works.
Until it doesn't ¯_(ツ)_/¯
At some point, it's useful to stop stumbling around and peek back at those holes.
While working through the course, I illustrated a set of notes to help me understand and remember all the concepts.
These illustrations aren't perfectly designed to explain the concepts they're about, and instead work as shorthand notes for me.
Take a look at Tyler's course if you want to dig into the concepts more.