Copied this from someone else as it had some handy info!

Combat Site Progression
Burrow -> Hideaway -> Refuge -> Den -> Yard -> Rally Point -> Port -> Hub -> Haven -> Sanctum
Damage To Resist
- Angel Cartel - 7% EM, 62% Exp, 22% Kin, 9% Therm
- Blood Raiders - 50% EM, 0% Exp, 2% Kin, 48% Therm
- Guristas - 2% EM, 1% Exp, 79% Kin, 18% Therm
- Mordu's Legion - 0% EM, 0%, Exp, 70% Kin, 30% Therm
- Sansha - 53% EM, 0% Exp, 0%, Kin, 47% Therm
- Serpentis - 0% EM, 0% Exp, 45% Kin, 55% Therm
- Amarr - 47% EM, 4% Exp, 7% Kin, 42% Therm
- Caldari - 1% EM, 0% Exp, 51% Kin, 48% Therm
- Gallente - 1% EM, 0% Exp, 60% Kin, 39% Therm
- Minmatar - 12% EM, 50% Exp, 31% Kin, 7% Therm
- Mercenaries - All (Therm & Kin are heaviest in lvl 4's)
- Drones - All

copied from Daevyd Chamorai