Damage type to protect against:
Guristas - Kinetic > Thermal
Serpentis - Thermal = Kinetic
Mordu's - Kinetic > Thermal
Blood - Electomagnetic = Thermal
Sansha - Electromagnetic = Thermal
Angel - Explosive > Kinetic > Thermal = Electromagnetic
Mercenary - Explosive = Kinetic = Thermal = Electromagnetic
EOM - Kinetic > Thermal

Main Damage type to shoot at the enemy:
Guristas - Kinetic > Thermal
Serpentis - Kinetic > Thermal
Mordu's - Kinetic > EM
Blood - Electromagnetic > Thermal
Sansha - EM > Thermal
Angel - Explosive > Kinetic
Mercenary - Kinetic > Thermal
EOM - Kinetic

Combat Sites (Easier -> Harder)
Hideaway ---> Burrow ---> Refuge ---> Den
Yard ---> Rally Point Port ---> HUB
Haven ---> Sanctum
Prefixes
(Nothing) ---> Hidden ---> Forsaken ---> Forlorn