Anyone that has worked with me recently will know I recommend reading the Google Site Reliability Engineer (SRE) book. The best part of that is that you can read it online for free.
It is a good read, but with anything this is a book on how SRE is done at Google and a lot of it may well not map to your environment or infrastructure.
As a counterpoint this LISA talk is good to watch, also quite entertaining.
SRE is the new Dev Ops. It’s good to keep up with the play, same as Serverless is the new Cloud. Like anything it is situational and not everything needs to be Cloud which I am sure is material for another post.