There is a material in the slot and you must click on the tools to turn the material into material that costs more, than sell it. Press S to sell and click tools to use them. To rent the quarry, hover your mouse over it and click R To buy it, hover your mouse over it and click B. Press C to collect something and then you will be able to drag it onto the slot to apply it to something. Press 1 or 2 to switch slots Some basic procedures: Break means that the procedure destroys the material used Log---Saw-->Plank Log---Hammer-->Break Rock---Hammer-->Breaks into random of nothing, quartz, iron ore(hematite), amethyst Amethyst---Saw-->Cut Amethyst Hematite/Iron ore---Heat--->Iron Plan---Saw-->Wood Piece Wood Piece---Apply Iron Sheet--> Hammer X2--> Saw X2--> Saw upgrade Wood Piece---Apply Iron--> Hammer --> Saw --> Hammer X3--> Hammer Upgrade Iron sheet---( Apply Iron Sheet --> Hammer X2 ) X3--> Apply Iron Sheet--> Furnace Upgrade Plank---Apply Iron--> Hammer X4 --> Extra Slot ----In progress of making----