game programming patterns

Hey, Game Developer!
Do you struggle to make your code hang together into a cohesive whole?
Find it harder to make changes as your codebase grows?
Feel like your game is a giant hairball where everything is intertwined with everything else?
Wonder if and how design patterns apply to games?
Hear things like “cache coherency” and “object pools”, but don’t know how to use them to make your game faster?