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In this video I do a deep dive in all locks obtained by postgres, I learned a lot while making this video and hope you enjoy it. 

0:00 Intro 

2:30 What are Locks? 

5:30 Overview of Postgres Locks

9:10 Table-Level Locks

11:40 ACCESS EXCLUSIVE

17:40 ACCESS SHARE

19:00 ROW SHARE

21:15 SHARE UPDATE EXCLUSIVE

23:30 SHARE

24:50 SHARE ROW EXCLUSIVE

25:18 EXCLUSIVE

25:30 Table Lock Conflict Matrix

28:30 Row-Level Locks

30:00 FOR UPDATE

33:00 FOR NO KEY UPDATE

34:00 FOR SHARE

34:40 FOR KEY SHARE

39:25 Page-Level Locks

42:00 Deadlocks

46:00 Advistory Locks

47:20 Summary

https://www.postgresql.org/docs/current/explicit-locking.html