[andresgaitan]

3 year Linux Sysadmin, here my 2c:

Buy ASAP both "UNIX and Linux System Administration Handbook" and "Practice of System and Network Administration".

UNIX and Linux System Administration Handbook -> Will give you the necessary tech skills and concepts. This is a sysadmin bootcamp.

Practice of System and Network Administration -> Will show you how to the job right. This is more like 'how to manage' an operations team.

Each book is massive and will take you 1 month to read. I suggest you start with UNIX and Linux System Administration Handbook.