Bonfire
Walk up to the bush and press F to collect the sticks. You need to do this two times.
Press the Tab key and select the crafting tab at the top left. Place two armfuls of sticks on the crafting table.
Click "Craft", then you can place a fire on the ground. Q and E rotate the fire, left click to remove the fire, and Esc cancels the fire.
Then light the fire with a lighter or matches.
Now you have a fire and you can cook food on it.
Rifle
This is one of the first quests. You will receive the following items: Plank, Metal Pipe, Throwing Bolt, and Duct Tape.
Press Tab and place items on the crafting table. Click "Craft" and then equip the rifle, but make sure you reload it. Remember: you need to reload after every shot.
Ax
Items Required: Old handle, bike sprocket and duct tape.
Press Tab and place items on the crafting table. Click "Craft" and then equip the ax.