And where, and why, and, given that (that at the time of the truth is the only thing that matters).

• What computer to buy for...
  Neither to pass to remain short: to each one his as his needs and his pocket (that is where the problems are).
  
  
• What components to buy for...
  Videocards? Tens exist. But they not all are equal of valid or of useful according to his destination. Also: why to pay more for anything that it will not use?
  
  
• How and where to buy
  The decalogue of the good buyer, or "How to face a useless, creeping and lying seller and to go out with the undamaged portfolio". Do not lose it!
  
  
• To buy second-hand
  In what cases must it be done, how to do it and for what can we expect from these buys.