I'm relatively new in this and recently I've been reading and hearing a lot about how distributed systems are overused and usually a monolith can do a better job etc. I'm working at a company serving millions of customers and distributed systems are utilized, most of my experience as a software engineer was built around this to the point that I was never around a codebase that is 10/20k+ lines of code. I feel like I lack some skills in modular monolith coding skills.
My question is what kind of sources can I read to improve my understanding of monolith vs microservices, when to use each, and the tradeoff of preferring one over the other?