For Animist It means that in RMSS you got +5 to all spell lists (skills).
Example: animist (RMSS) baselists +10, opens +5 , closed +0, general +50, In bonus +8, Animist profession +5 to group:
Category bonus for spell casting : open lists 50 (general)+5 (open list) +8 (stat) +5 (profession bonus) = 68 ; closed 50+0+8+5 =63; base 50+10+8+5 =73
Most professions get several groups for profession bonuses e.g. fighter gets armor and weapon, Thief gets awareness, subterfuge and weapon