The Lillero Book
This is meant as an in-depth guide to ASM manipulation with the Lillero framework. While that's the main focus, it's written to also be useful to anyone wanting to learn ASM patching in general. Some parts (which will be flagged appropriately) may be applicable to Minecraft alone, but most of the book is meant to be generic.
The ASM library that Lillero is built with is capable of so much more than what is described in this book. In fact, the official ASM guide is a must-read for anyone wishing to understand its inner workings more in depth. In fact, this is no replacement for that guide: think of the Lillero Book as a (relatively) simple introduction to the topics covered by the ASM guide in detail.