Anomalies are ranked in difficulty by 10 levels, these are:
Burrow / Drone Collection (easiest)
Hideaway / Drone Cluster
Refuge / Drone Assembly
Den / Drone Gathering
Yard / Drone Surveillance
Rally Point / Drone Menagerie
Port / Drone Herd
Hub / Drone Squad
Haven / Drone Portal
Sanctum / Drone Horde (hardest)
An anomaly may be further sub-divided into 3 more categories:
Hidden [easiest]
Forsaken [normal]
Forelorn [hardest]

** Damage types ***
Guristas - Kinetic / Thermal
Serpentis - Thermal / Kinetic
Blood Raider - Thermal / EM
Sansha's Nation - EM / Thermal
Angel Cartel - Kinetic / Explosive / Thermal
Minmatar Fleet - Thermal / Explosive
Amarr Navy - EM / Thermal

***Hardeners to use***
Angel - All
Amarr Navy - EM/Thermal
Blood - EM/Thermal
Caldary navy - Kinetic/Thermal
Gurista, Mordus, Gallente - Kinetic/Thermal
Khanid - EM/Thermal
Mercenary - EM/Thermal/ (Kinetik missiles)
Mordus - Kinetic/thermal
Odamian - Kin/therm
Rogue Pirate - EM/Expl