Damages Encountered (By %); Tailor your resists to optimize;
For L4 Missions:

Gurista/EoM: 75% kin | 25% therm
Angel: 70% exp | 20% kin | 10% em
Sansha/Blood/Amarr: 50% em | 50% therm
Serpentis/Caldari: 50% kin | 50% therm
Gallente: 50% kin | 40% therm | 10% em
Minmatar: 50% exp | 20% em | 20% kin | 10% therm
Mercenaries: 50% therm | 30% kin | 10% exp | 10% em
Rogue drones: 70% exp | 20% kin | 10% therm

Note that some npcs do not follow this trend, e.g., Elite Drone Parasites, Gist Seraphim, etc

*** Damage types ***
Amarr Navy: EM / Thermal
Ammatar Navy: EM / Thermal / Kinetic
Angel Cartel: Explosive / Kinetic / Thermal
Blood Raider: EM / Thermal
Bounty Hunters: EM / Explosive / Kinetic
Caldari Navy: Thermal / Kinetic / Explosives
Cent: EM / Thermal
Core: Kinetic / Thermal
Corpus: EM / Thermal
Dark Blood: EM / Thermal
Domination: Explosive / Kinetic / EM
Dread Guristas: Thermal / Kinetic
Freedom Fighter

W-Space Designations
Class 1 H121 P060 Q317 V301 Y790 Z647 Z971 Z647
Class 2 C125 D364 D382 G024 I182 N766 R943
Class 3 C247 L477 M267 N968 O477 O883 X702
Class 4 E175 M609 O128 T405 X877 Y683 Z457
Class 5 H296 H900 L614 M555 N062 N432 N770 V911
Class 6 A982 B041 R474 S804 U319 U574 V753 W237

K-Space Designations
Class 7 (High) A641 B274 B449 B520 D792 D845 N110 S047
Class 8 (Low) A239 C140 C391 J244 N290 N944 R051 U210
Class 9 (Null) C248 E545 K329 K346 S199 V283 Z060 Z142


Trig-space Designations
C729, X450, F216, U372, R08