[northstar702]

I thought this was really useful in getting a quick overview of a variety of systems in the real world, even though the book itself is designed to answer interview questions. https://www.amazon.com/System-Design-Interview-Insiders-Guid...

[mirchiseth]

Came here to say the same. System Design Interview book has digestible level of info on what the OP is asking (I think :-) )