Too Long; Didn't Read
There is plenty of content out there describing what Continuous Integration, Continuous Delivery and Continuous Deployment are. But what are these processes for in the first place? It is crucial to understand the problems CI and CD solve to use them properly. It is NOT about having all your tests green all the time and the main branch deployable to production at every commit. Merge your code very often and pull very often. Split the task you are working on into smaller tasks. This way nobody works apart for more than a day or two and problems do not have time to snowball.