You can find many great educational videos that provide a really detailed introduction to some of the more complex ML concepts. I'm a big fan of the videos from 3Blue1Brown, Welch Labs, and Jia-Bin Huang.
This used to be a manual grid table (topics × providers), but it grew past what a hand-edited Notion table could handle cleanly, so it's now a database. Each video has Topic, Provider, Level, and Subtopic properties — Subtopic replaces the old color-coding trick, so you can filter to it directly (e.g. filter Subtopic = "Attention Mechanism" to see every video on attention across channels, regardless of who made it).
Two views are set up on the database itself: By Topic (grouped by topic, sorted by provider then level) and By Provider (a board grouped by provider). Below is a live view of the same data, embedded on this page.