Probably some of the most important words you can learn in any language (after you learn where you can run off to when you are doing the pee dance, and where you can get something to eat that is not currently squirming) are swear words. Expressing frustration, anger, ridicule and disgust are important parts of creating shades of meaning, and Polish seems to be especially expressive in this regard, next to maybe Russian. The Polish nation has been through a wide range of historically frustrating experiences (to put it mildly), and this has colored the vernacular with a wide palette.
One site that has a plethora of cussage is "YouSwear" which has a number of Polish curse words, among other languages (curiously enough, they also have curse words in "Chicken"). There is also the Toolpaq Guide To Polish Curse Words as well, which is more systematic and discriminating in its treatment. Another list is on Nawcon, which has a page called "Polish Language Swearing."
A site that is not quite as comprehensive is the "Cursing And Swearing Dictionary," which, nonetheless, seems to cover some of the basics. There is another short list on insults.net, and a short blog post on Transparent, which discusses usage somewhat but not nearly enough. Also, there are some words on Memrise, but you can only see five words a page and there are a total of twenty.
Doubtless there are other sites out there as well...let me know if you find the gold mine.