For the following factions you should deal damage and tank:

Angel
damage: explosive
tank: (in this order of how much damage they do) explosive, kinetic, thermal, EM (mind you they do so little thermal and EM its not worth worrying about)

Guristas
damage: Kinetic
tank: Kinetic, Thermal (they occasionally do EM, but again not worth worrying about unless you see tech 3 sentry guns)

Serpentis (see gurista)

Sansha's Nation
damage: EM (even against their armour tanks!)
Tank: EM and Thermal (lots of it aswell)

The Blood Raider Covenant (see Sansha's Nation)

Gallente Federation
damage: Thermal
Tank: Thermal and Kinetic (sometimes a little EM, but not worth worrying about.)

Minmatar Republic (these guys are tough)
damage: Thermal
tank: everything. Sometimes they deal almost all Explosive and others they deal almost all Thermal and EM. There is always Kin present, but never dominant. Anyway, If you fight frigate s