Minecraft wiki entry for Redstone_computers, associated text: All computer systems have at least one processing unit. During operation, processing units execute instructions stored in the computer's memory. For a good start on Minecraft computers you should learn computer science. There are many sources and tutorials to learn computer science but for a basic start, it is recommended to watch Crash Course on Computer Science especially episodes 1–8. Although it isn't completely thorough, it can work as a basis in your understanding of computers.