How Do I Build a Fire?
You should pick up the stick in your backpack, break it on your knee and put it on the ground to make a fire!
When you kneel down and have the stick in your hand sideways look around until you see some dashes on the ground. Then hit left click and you should break them.
Note: The new system is a DIY approach, but you can switch to the old system with a button press while you have your survival (build) guide up.
Devs kept the old building style along with the new one, hold X when you have the building guide book out to swap between the two.