Animation speed rate for SP and MP (?)

ClipSets for entering and exiting a vehicle.

Cover bounds are set using vehicle collisions. This section allows setting cover bounds offset for the layout.

Name tells everything, contains values for animations speeds for slow and fast gear, character leaning, helmet use, etc.

Camera angles for Los Santos Customs (?)

Name tells everything, the section allows to set conditions for clipsets grouped as entry animation variations.

Basically a section to set "extra" points for the vehicles based on desired bone and offset to that bone.

As the name tells, it defines weapon groups for drive-by (shooting inside the vehicle). By default consists of one-handed, two-handed, etc.

Drive-by animations

Drive-by angles of aiming, animation references, and other values.

Seat bone name, seat shuffle, rear set link, flags.

Animations clipsets from ClipSetMaps, drive-by info and other useless stuff.

Which door, handle, and side to use. Also, which seat can be accessed with that EntryPoint.

EntryPoint animation clipsets from ClipSetMaps.

Explosion delay and position. Parts velocity and angle.

Probably the most important section, this is where you make a summary of the entire layout; which seats, entry points, animations.
The name you use, will be the layout name in vehicles.meta

Scenario layouts, such as train driver.

Animation overrides, such as prostitutes.

Name, just FOV settings for first person.