As noted above, Quick Keys (Favorites List, System and Departments) are not mandatory. However they can be pretty helpful to turn certain "things" on/orr quickly.
To help me remember how I have assigned quick keys, I include the number in the name of the FL/System/Department.
For example a department called "Fire" with a department QK of 1 in the "MetroSafe" system with a system QK of 0 in the "Jefferson County" Favorites List (FL QK of 2) ends up being:
F2 Jefferson County
S0 MetroSafe
D1 Fire