As part of their celebration of SysAdminDay coming up on July 29, Linux Foundation Training will email you a different eBook tutorial each week over the coming 22 weeks. You MUST sign up by the end of July
Each eBook will give a short overview of one topic that SysAdmins or interested users should know. Topics will include using the command line (CLI), filesystems and storage, RAID and Swap, and Security.
You macOS users should keep in mind that much of this applies to you as well.