[prxtl]

Apart from the resources in the other comments, I also benefited greatly by understanding the theory and principles behind CI and CD.

The Continuous Delivery (2010) book is a good place to start, along with Accelerate (2018).

The Phoenix Project (2013) is a fun read, inspired in many ways by The Goal (1984) which although fantastic, is quite a dry read.

https://trunkbaseddevelopment.com/ is a great resource and entirely free to read online.

Might not be relevant to you, but I work with mobile apps so “Continuous Deployment of Mobile Software at Facebook” (2016) was quite insightful: https://research.facebook.com/publications/continuous-deploy...