Best Damage to NPCs:
Angel/Thukker - Exp
Caldari/EoM/Gurista - Kin
Merc - Therm
Blood Raiders/Sansha - EM/Therm
Syndicate - Kin/Therm
Rogue Drones - EM
Mordus/Serpentis - Therm/Kin
Concord - Kin

Combat sites grading (more like my shields where are my shields, easiest -> toughest)
Faction: Hideaway* > Burrow > Refuge > Den* > Yard > Rally Point* > Port > Hub* > Haven > Sanctum (Low and null sec)
* 4 levels of difficulty available standard > hidden > forsaken > forlorn

Drone: Cluster > Collection > Assembly > Gathering > Surveilance > Menagerie > Herd > Squad > Patrol > Horde (low and null sec)

** W-SPACE DESIGNATION **...
Class 1 H121 P060 Q317 V301 Y790 Z647 Z971
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
===================================
C1: dark blue and green;
C2: dark blue and a little blue;
C3: Gray and slightly pale pink;
C4: Orange and green;
C5: Dark orange and a little grey;
C6: Red and black.
=========================================
[NPC] [Damage it uses] - (Damage to use against it)
Angel - Kinetic/Explosive - (Ex)
Amarr - Navy EM/Thermal - (Th)
Blood - Raiders EM/Thermal - (EM)
Caldari - Kin/Thermal - (Thl / Kin)
Concord - Kin/Thermal - (Th)
Gallente - Kin/Thermal - (Th)
Guristas - Kin/Thermal - (Kin)
Khanid - EM/Th - (Thermal)
Minmatar - Fleet Thermal/Exp - (Th / Ex)
Mercenary - EM/Th/Kin - (Th)
Mordus - Kin/Th - (Kin)
Odamian - Kin/Termal - (Kin)
Drones - all Dmg types - (EM)
Rogue - Pirate EM/Explosive/Kinetic - (EM)
Sansha - EM/Th - (EM)
Serpentis - Kin/Th - (Th)

================================================= [ Damage types Rec'd ]
Damage Dealt ...| EM | Therm | Kin | Explos | Recom. Damage| Dealing
Angel Cartel .......| 7% | 9% | 22% | 62% | Exp | Target painters
Blood Raiders ....| 50% | 48% | 2% | 0% | EM | Tracking disruptors, Neutralizers
Guristas Pirates..| 2% | 18% | 79% | 1%