Crude Tools are the lowest quality tools, but making at least a Crude Axe is necessary to progress. Crude tools include:

To make either of these tools, combine a StickIcon Stick with a StoneIcon Stone by holding one of them while clicking on the other (which must be on the ground); a menu will then pop up letting you decide which tool to make. Sticks can be found near trees, while stones can be found around metal deposits and in the starting area.