Where should I learn System Design (HLD + LLD) properly?

Hey Everyone,

I am a full-stack developer (React, Node/Express, Go, PostgreSQL, Docker, real-time apps) and now want to get serious about System Design.

I want to learn both:

• HLD → scalability, databases, caching, load balancers, microservices, etc.
• LLD → clean class design, OOPs, design patterns, real-world problems (parking lot, ride sharing, etc.)

There are too many resources online, so I’m confused where to start.

What are the best books/blogs/repos/channels to learn System Design in a structured way (for interviews + real-world knowledge)?

Would love suggestions and roadmaps from people who have already done this