Ethereum EVM illustrated
The book Mastering Ethereum does a great job explaining most important Ethereum aspects, but it often helps to have a 'visual aid' to truly understand how things work.
Enter Ethereum EVM illustrated, a document dating back to 2018 that really helps you understand most of these abstract concepts:
For additional reading, see also: https://ethereum.org/en/developers/docs/evm/ & especially the section #further-reading 📕
Illustration by @alexdndz on Reshot