You might want to have a look at the OSDev wiki [1], which is definitely more comprehensive than those notes.

[1] http://wiki.osdev.org/Main_Page

This would be a great format to tackle the more advanced stuff that I have problems learning.

A wiki isn't the best format, at least for me.

Honestly the only good wiki I've ever seen is Wikipedia, and that's only because Google exists. Wikis suffer from the most ridiculous discoverability problems. Unless you can successfully guess a page's title, find it on Google, or the wiki has good searching (many don't), I find myself clicking around random pages to see where to start.

Especially when I am dumped into a random wiki for the first time. Starting off in Minecraft years ago, people said "read the wiki first!" with no link to the first page I should read, or any successive pages. Completely useless.

Maybe I'm missing a nice table of contents that every wiki secretly has hidden away, but tables of content exist for a reason. Discoverability.

I feel the same way.

Same feels there.

Yup, I went through this book about a year ago to make a rudimentary kernel. It was great for learning purposes, but it stops right about where things get interesting (drivers of any kind). I ended up at the OSDev wiki for a lot of further work.