Does anybody have an idea on how to get in to Metal programming (as in Apple Metal)? I'd love to mess around a little with this on iOS and macOS while learning about tile-based rendering, but I have trouble locating educational written material.

There's a book (https://metalbyexample.com/the-book/), but the author has put up a note that it's quite out of date. It seems the most up-to-date information is available in the WWDC videos (regarding e.g. Metal 3), but I'd really prefer something written. And Apple's documentation reads more like a reference material and is quite confusing when starting out.