GPU = Graphics Proccessing Unit. Basically just a graphics card for your computer. Can purchase Large like an R9 290X or smaller ones like a 750Ti.
At this point, GPU mining is basically for hobby only.... and for those with cheap electricity. I do have some left over GPU's from my earlier mining days that I would be willing to part with for cheap if you are interested.
Some GPU resources below:
http://www.coindesk.com/information/how-to-set-up-a-miner/
https://www.reddit.com/r/gpumining/
https://litecoin.info/Mining_hardware_comparison#GPU
https://www.cryptocoinsnews.com/guide-setting-gpu-mining-rig/
The current generation of miners run with ASIC chips which are much more efficient but at the same time much more costly.
Okey thanks for info At this point, GPU mining is basically for hobby only.... and for those with cheap electricity. I do have some left over GPU's from my earlier mining days that I would be willing to part with for cheap if you are interested.
Some GPU resources below:
http://www.coindesk.com/information/how-to-set-up-a-miner/
https://www.reddit.com/r/gpumining/
https://litecoin.info/Mining_hardware_comparison#GPU
https://www.cryptocoinsnews.com/guide-setting-gpu-mining-rig/
The current generation of miners run with ASIC chips which are much more efficient but at the same time much more costly.
i want to try and learn 'bout that 
but if i not understand 'bout something there, can i ask you again ?