Best resources for learning system design in 2025?

i'm trying to compile a list of the best resources for learning system design in 2025. obviously, 'designing data-intensive applications' (ddia) is a classic, and alex xu's books are highly recommended for interview prep. but i'm looking for things that cover more contemporary topics and real-world applications. i'm thinking about resources that touch on things like edge computing architectures, serverless at scale, federated learning, or modern ai infrastructure patterns. engineering blogs from companies like netflix, uber, google, and meta are always great, but it's hard to get a structured learning path from them. are there any newer books, courses, or even specific YouTube channels that you've found invaluable for staying current with system design best practices? what's on your must-read list for someone building complex distributed systems today?