This is just a small collection of some random stuff I've been using to figure things out.

Displays Coordinates, Heading (including compass directions) and Time in the bottom left.

Commands

golden will set your cores and outer bars to overpowered

weather can be used to quickly change the weather

weapon can be used to give yourself a weapon with ammo

spawn can be used to spawn a ped

swap can be used to quick swap models in a radius around player. Model is only swapped for a few seconds but is helpful for finding possible model names.

model_search can be used to find valid models quickly when they are numbered. It tests a few known numbering systems as a suffix to the input value.

native can be used to run native commands fairly easily from in game.

So if you wanted to give yourself a Pump Shotgun with the native command you can run:
ex. native 0xB282DC6EBD803C75 PLAYER_PED HASH_WEAPON_SHOTGUN_PUMP 500 true 0
This will automatically look up hashes if the string starts with HASH_. PLAYER_PED will be replaced using PlayerPedId()

String starts with HASH_ = GetHashKey of remaining string

String starts with STR_ = CreateVarString of remaining string

PLAYER_ID/P_ID = PlayerId()

PLAYER_PED/P_PED = PlayerPedId()

PLAYER_COORD/P_COORD = GetEntityCoords(PlayerPedId())

PLAYER_COORD_GROUND/P_COORD_G = GetEntityCoords(PlayerPedId()) - { 0.0, 0.0, 1.0 }

PLAYER_DIR/P_DIR = GetEntityHeading(PlayerPedId())

true/false Will be turned into a boolean

0x3f/172/41.5 Will be turned into a number

Using page_up and page_down keys you can enable/disable tracking of Peds/Vehicles and Entities/Objects