Crafting and building is where you will waste the preacious materials you worked so hard for. Recepies are found in their own tab. Recepies are unlocked by simply havinmg the right materials. Opon start of the game, there will be no recepies in your crafting tab, as you gather more materials and provide yourself with a crafting bench nearby, you will be able see any recepies you can afford. After a recepie is unlocked, it will gray out instead of completley dissapearing when you cannot afford it.
Same ulocking system with building. To build, you must enter build mode by cycling through the three modes of your character using space bar. Once you see the build outline, you can select something to build with in the menu. You will see the outline change, indicating what you have selected. Simply clock where you want to build and if you have enough materials, it will appear there. Shift click to destroy stuff.