[ceph-users] Training on ceph fs

Hi, I inherited a ceph fs cluster. Even if I have years of experience in systems management, I fail to grasp the complete logic of it fully. From what I found on the web, the documentation is either too "high level" or too detailed. Do you know any good resources to get fully acquainted with ceph (specifically, ceph fs)? Or any live training I could attend? Thanks in advance for your help, Emmanuel