Damage you should deal:
Sansha: EM (or Thermal secondary)
Amarr or Blood Raiders: EM or Thermal
Gallente or Serpentis: Thermal or Kinetic
Caldari or Guristas: Kinetic (or Thermal secondary)
Minmatar or Angel Cartel: Explosive (or Kinetic secondary)

Damage they deal to you:
Sansha: All types (EM primary, Thermal secondary)
Amarr or Blood Raiders: EM and Thermal
Gallente or Serpentis: Kinetic and Thermal
Caldari or Guristas: mostly Kinetic and some Thermal
Minmatar or Angel Cartel: All types (Explosive primary, Kinetic secondary)

Jammers
Amarr ----> Radar = White Noise
Caldari ---> Gravimetric = Spatial Destabilizer
Gallente --> Magnetometric = Ion Field
Minmatar -> Ladar = Phase Inverter

*** Stacking Nerfs ***
1st: No Nerf
2nd: 87% Effectiveness
3rd: 57% Effectiveness
4th: 28% Effectiveness
5th: 11% Effectiveness
6th: 3% Effectiveness