I learned about the qualities of computer. Computer has different kinds of stuff.When you go to buy a computer make sure it has everything like monitor,mouse,speaker,keyboard and etc. First see which ones process is higher. We should know the graphic. We should choose our computer for what we our propoces are. When graphic card is shared it means this shares memory with PC,its not its self memory. We can find computers wired or wireless. If the computer has more MHZ, the best and more speed and caratey the computer has. If you plug video computer,you need to have firewire. If you found a refurbished computer in the shops it means that it was used once but it broke or something then they repaired it and now it again came to the market.