Orienteering has seven standard courses (White, Yellow, Orange, Brown, Green, Red, Blue). At local recreational meets, you may do
any course that's within your navigational and physical abilities.
In general, beginner courses are on or near trails (or other linear features, like fences), and
you can look for large, distinct features, such as trail junctions or hilltops.
The four advanced courses all have the same level of navigational difficulty (i.e., looking for
small point features, such as boulders or lone trees) but differ in their distances and climbs.
At National A-meets
(which are competitive ranked events), you run in your competitive age class or an open class (all ages).
For a detailed description of courses, see "Guides & Forms" > "Guides: Courses/Classes".
There are many types of events other than the standard Point-to-Point format.
Score-O, Goat, Memory-O, Motala, Rogaine, Trail-O, String-O, Mountain Bike-O, Ski-O.
For a detailed description of types of events, see "Guides & Forms" > "Guides: Type of Events".