HP is not the best. There really isn't a best brand, it all depends on what you're looking for. HP has some nice business computers, if you're planning on distributing them to lots of offices. It...
It is in the case, also referred to as the tower. When you look in it, the mother board is the biggest thing in there. All other cards and cables plug into the mother board which is why it is called...
To some degree, yes. It is possible in the sense that you can put a motherboard in a portable case, connect it to battery power, use smaller drives, etc... The main issues in doing so are heat...