Damage types to tank:

Amarr Navy: EM, Thermal
Angel Cartel: Kinetic, Explosive, Thermal
Blood Raider: Thermal, EM
Gallente: Kinetic, Thermal, EM
Guristas: Kinetic, Thermal
Mercenary: Kinetic, EM, Thermal, Explosive
Minmatar Fleet: Thermal, Explosive
Mordu's Legion: Kinetic, Thermal
Rogue Drones: Thermal, Kinetic
Sansha's Nation: EM, Thermal
Serpentis: Thermal, Kinetic
The Seven: Explosive, Thermal, EM
Thukker: Explosive, Thermal

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Main damage types to use against enemy groups:

Angel Cartel: Thermal
Blood Raider: Thermal
Guristas: Kinetic
Mercenary: Thermal
Mordu's: Kinetic
Sansha: Thermal
Serpentis: Thermal