[header] How to understand computers [title] Decide what you need the computer for. [step] There are different kinds of computers you could buy : [substeps] Desktop computer: has a computer tower, and a separate monitor. More wires, and size, built for home use. 
If you are using a computer at home for just checking email, or typing documents, and don't need a lot of portability, then you should go for a desktop. If you don't customize and upgrade your desktop, an all-in-one desktop would do as well.