This document discusses several key concepts in distributed systems including event ordering, mutual exclusion, concurrency control, deadlock handling, and election algorithms. It provides details on implementing happened-before relations to ensure event ordering. It describes centralized and distributed approaches for mutual exclusion and discusses two-phase commit and locking protocols for concurrency control. It also covers deadlock prevention techniques like timestamp ordering and various distributed deadlock detection algorithms. Finally, it summarizes bully and ring algorithms for electing a new coordinator when failures occur.