Is there any advanced book that teaches automation with some real life examples? I can automate the simple parts, but as I add things, it turns to spaghetti qui

Is there any advanced book that teaches automation with some real life examples? I can automate the simple parts, but as I add things, it turns to spaghetti quickly. Lots of minor things that needed to be added, each with minor tweaks that depends on other minor things. Often end up as some tangled web of mess. I think there must be some design patterns to help with this, but I don’t know much about that, and there is only so much you can learn as an amateur coder working on personal projects.