This is an amazing growth industry to be in right now. If you don't have a DataCenter Background, you should consider getting familiar with the common terminology and metrics. PUE, WUE, etc.
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Absorb industry blogs like EC&M and Mission Critical.
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Understand design redundancy (N+). Understand the way different cooling systems are utilized: Chillers, Adiabatic, DX.
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Energy optimization initiatives (Rack containment)
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Understand the application and use of integrated/industrial controls and SCADA systems.
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This is a great book to reference:
There’s a couple reference books that I’ve found helpful for general info:
Data Center Handbook https://www.amazon.com/dp/1118436636/ref=cm_sw_r_cp_api_i_t6DODb7ZJSH24
Maintaining Mission Critical Systems in a 24/7 Environment https://www.amazon.com/dp/0470650427/ref=cm_sw_r_cp_api_i_W6DODbJ3HR1XM