Yep, they are all chinese but very different from each other. Cantonese is used in Guangdong Province mainly, but actually many Chinese who live in abroad speak Cantonese as well, and people from Hong Kong speak that too :) Shanghainese hmm... as you saw, people live in Shanghai speak it and maybe some other places which around Shanghai speak that too, i'm not sure sorry. Taiwanese is used in Taiwan and Fujian province mainly in China, it's called 闽南语 Minnanyu though in China. haha you are right there're even more :P Chinese mandarin isn't on the list, it's called Mandarin, that's it :)