HELP! LAPTOP NEWBIE! NEEDING HELP!

okay, bluetooth is a new for of wireless communication.
it allows for bloototh enabled devices to communicate over short distances.
So for example you could have a PDA that wirelessly connects to your PC or laptop using bloototh, of you could have headphones with a cell phone that wirelessly cary the audio to your ears. Or say you have a digital camera with bluetoother and a laptop with bluetooth, then you can wirelessly transfer pictures, no need to plug the sucker in!
Basicly bluetooth is another form of wireless communication for devices. It's pretty cool, and it will get better (faster!) as time goes on.

WIFI is a wireless tech. Works exactly like your cell phone, except on a less wider basis. The way it works is a laptop (pda, etc) wich is WIFI enabled picks up a signal from a router, it locks on to the signal automatically, and allows you to access the net. The further you get away from the router, the less effective the signal. Once you are out of "coverage range" you lose the signal. There are two formats right now, b, and g.
b uses 11mbps transfer, and g uses 54mbps transfers. the g format also goes longer distance, so it is the superior format. Almost all laptops today come with built in b/g so you dont have to worry about chosing between the formats.
Centrino tech is good for integrating wireless for laptops, but it's not needed for good performace. use a Pentium M and it will do just as well 9and cost you less).

BTW, so you know, Centrino is NOT NOT NOT a type of proccessor. it is a combo of several components that are packaged together and are labeled "centrino", however all "centrino" systems run on pentium M. Thje only difference between Pentium M systems and "centrino" systems is that centrino uses Intel hardware, while Pentium M systems uses a pentium chip, and 3rd party wireless. Hope that helped!

A word about apple, dont buy one!
Sony and apple are overpriced for what you get. They dont deliver enouph power for the price you pay.
If you want a bargain and dont care about battery life, buy a dell, if you want portability....then look at HP, Toshiba, maybe gateway.

Depends what you are using your laptop for.

Alienware systems are awesome for gaming, they are expensive but you get what you pay for. I really don't know if they are reliable, I haven't got one myself but from what I've read I think they are.
As for their WIFI card, I can only say that the internal one (which is the one you really want if you are in college and plan going everywhere with it), I've heard it's not that good. Reception is terrible from what I've read. Finally, you should consider that alienware systems are really heavy, if you are going for a desktop replacement like the Area 51m. They weigh a little over 9 pounds. Battery life doesn't go over the 2:30 hours mark so you have a problem there too. Unless you plan on buying their Sentia notebooks (which have longer battery life, and weigh a lot less) and if all the things I mentioned above matter to you, you should look into buying another notebook. Also these laptops were meant for gaming, so if you are just using basic programs, you should stay away from alienware.

As for powerbooks I can only say their WIFI card is awesome. It's one of the best I've seen. You should consider on buying one if you don't mind the compability issues it has with all the programs out there. Just keep in mind that a lot of stuff out there is made for windows. They are great for video editing and everything related to multimedia. Battery is in the range of 4-5 hours, depending on the notebook that you chose.

So it really depends on what you are looking for, personally I don't like Apple, but that's just me.

Alright let me break it down cuz i just learned all this in the last 4 months cuz i also bought a laptop. First of all powerbooks and ibooks are apple pc so if you want to deal with mac then go for it. As for buying an alienware, well they are a little more expensive than the powerbooks. Maybe a Toshiba Satellite. Ok, now here are the answers to your questions:

1.could someone explain to me what bluetooth can do?
Bluetooth is a type of wireless capability that is usually enabled in cell phones and in some laptops so you can connect some devices. It's not the biggest hype but it works and it also comes in most apple notebooks.

2.could someone plz explain the whole deal with WIFI?
WiFi which stands for wireless fidelity is the able to use transmitted signals over the air at different speeds. In conclusion it is wireless connection which can be obtain by using a wireless router.

3.i mean how do i get it from universities' router? and how far can i go away from it?
Well some universities enable wireless router but not all because the range isn't the best. The most you can go with the best wireless router is probably 150 feet without any obstructions as in walls and other interferences. It is most likely that you will be having an wired ethernet connection for your dorm room so don't worry about it as much but still consider it a priority.

4. what are all those G a/b types?
By "G" I think you mean "Ghz" which means a strong frequency operating over 1,000 megahertz. Kind of like a cordess telephone. As for the "a" which is the fast wireless connection in some standards but expensive and operates at a 5.8Ghz and can give you internet at the most of 108Mbps. While "b" is the best for budget but transmits at 11Mbps and works at a frequency of 2.4Ghz. Now, "g" is the common zone because it is affordable and as fast as well which operates at 2.4Ghz and lets you download at 54Mbps. This is one of the best standards for now. I've used this connection and it's as fast as my desktop pc. I recommend it.

This is something you should consider if you can use a wireless connection. By the way really consult the cnet or some other good site guide about the right selection of a laptop. Get one with over a 4 to 5 hour battery life if you can and good graphics. Get a 40GB hard drive, less than 5 pounds, and any other thing you might need

P.S. Enjoy college and the girls cuz I can't go but I hope buying the right laptop things go smoother for you. Peace.