"I dont know anything about this gridcoin" - Using your computer (CPU/GPU) to "mine" Gridcoin is always a win-win situation, because you are giving away your computational power to projects like exploring/mapping the universe, finding new medicines, etc. Basically, if you are a Gridcoin "miner", then you are an active part of the world's biggest scientific supercomputer. :) Your computations give value to the world. Instead of being a simple power consuming dumb node, like when you mine Bitcoin or another classical PoW coin.
Scientists get computing power, you get a few bucks. Greatest idea ever ^_^