If you're new to Eve, here's some useful information:

Damage Types/Resistances:
Guristas (Caldari) -> Kin/Therm
Angel (Minmatar) -> Expl
Blood (Amarr) - EM/Therm
Sansha (Amarr) - EM/Therm
Serpentis (Gallente) - Kin/Therm
Khanid (Amarr) - EM/Therm
Mordus (Caldari) - Kin/Therm
Amarr Navy - EM/Therm
Caldary Navy - Kin/Therm
Gallente Navy - Kin/Therm
Minmatar - ALL (Kin/Therm)
Thukker - Expl/Kin/Therm
Roque Drones - ALL
OeM- Kin/EM

Stacking Penalties :-
Module Count Effectiveness

1 100%
2 86.9119980800%
3 57.0583143511%
4 28.2955154023%
5 10.5992649743%
6 2.9991166533%
7 0.6410183118%
8 0.1034920483%
9 0.0126212683%
10 0.0011626754%
11 0.0000809046%

Wormhole Space
Class 1, 2 and 3 ... lead into unknown parts of space.
Class 4 and 5 ... lead into dangerous unknown parts of space.
Class 6 ... lead into deadly unknown parts of space.