Novice, meaning these trails are suitable for riders with no, or limited off-road riding experience.
While some off-road riding experience is beneficial, it is not required. Novice off-road road riders should have no trouble on grade 2 trails.
While grade 3 trails generally do not require expert off-road riding skills, some off-road riding experience is highly advisable, if not actually required, since grade 3 trails could include thick sand, deep mud, gradients with loose surfaces, and even water crossings.
Riders attempting grade 4 trails should be fully conversant in, and have extensive off-road riding experience.
Grade 5 trails are only for expert off-road riders with extensive technical off-road riding experience, since off-road driving hardly ever gets worse than the conditions found on grade 5 trails.