Resources for Getting Started with Distributed Systems https://caitiem.com/2017/09/07/getting-started-with-distribu...
Distributed systems theory for the distributed systems engineer http://www.the-paper-trail.org/post/2014-08-09-distributed-s...
Distributed Systems for Fun and Profit http://book.mixu.net/distsys/
Notes on the Theory of Distributed Systems http://cs-www.cs.yale.edu/homes/aspnes/classes/465/notes.pdf