Hey there, sadly this isn't an introduction and therefore doesn't belong in this section. D: But this question is something you can very easily Google and you can see a chart of type advantages and disadvantages right here on Bulbapedia. Next time, just feel free to ask general Pokemon game questions like these over at the Quick Questions thread at Pokemon Gaming Central; we'd love to help you there!
You can also shoot a PM my way if you're confused about the forum and I'll get back to you as soon as I can. ^^