Or, that you wish a mentor of the particular type, if skilled, would teach:

(Doesn't have to be realistic.)

e.g.

Tanks:
  • Minimizing angular movement of mobs.
  • Timing stuns and pacifies (largely for the above purpose).
  • Maximizing blocks and parries via turning.
  • Timing cooldowns for maximum effect.
  • Cooldown deployment rate between pulls.
  • Cooldown usage as to buffer just enough for full healer dps (Banes, Miasma II, Aero III, Holy/Gravity, etc., or for DoT maintanence on bosses).
  • Healer CD awareness and coordination.
  • When to sprint in dungeons.
  • Balancing enmity and dps.
  • Directing kill order directly (marks).
  • Directing kill order indirectly (who you debuff or place enmity on; consistency in general order rules).