Press F2 for inventory, or open it from the interaction menu (M). You will see groups like Quick Use, Items, and Wallet.

Pickup, drop, and use actions show short feed messages so you know what changed.

Weapons and ammunition appear in your inventory and on the weapon wheel. Buy starters at Ammu-Nation, or get illegal guns from Oscar later.

The Compact Rifle from Oscar can be fired from bikes and motorcycles. Heavier illegal rifles and the Assault Shotgun are also on Oscar's van, at a much higher price.

Police can seize illegal items during a frisk. You can also lose weapons and contraband when you die, unless insurance helps you keep them.

Medkits and armor are common consumables. Use them from inventory. You will see a short use animation and a feed line like Used 1x Medkit.

Convenience stores, Ammu-Nation, hospitals, and the Armory all sell supplies.