Platform engineering is the discipline of designing and building toolchains and workflows that enable self-service capabilities for software engineering organizations in the cloud-native era.

Platform Engineering

Absolutely recommend. There's a lot of practical  advice in there, particularly around SLOs.

+1 to Mike's comment. Another book with good advice about applying SRE practices in the real world is "Seeking SRE" (O'Reilly 2018) <https://learning.oreilly.com/library/view/seeking-sre/9781491978856/>