This has been put on hold.

Holà! Your question is not clear. No sé exactamente lo que quieres saber.

The title is misleading. Cantonese is not Chinese? Chinese 中文, refers to the written Chinese language, the characters system. The spoken language is not referred to as Chinese, outside of a sense of Mandarin, which is most widely spoken. The spoken languages are Chinese dialects or regional dialects， 方言. Cantonese is a spoken Chinese dialect. Educated Cantonese speakers all read standard Chinese. But like most Southern Chinese dialects, spoken Cantonese does not follow the same syntax as written Chinese, which follows Mandarin closely. Cantonese is the only Chinese dialect that has created a "special" character set used only for Cantonese and to express spoken Cantonese that is widely seen in Cantonese comic books and the like. Most of the characters are still easily legible to non-Cantonese speakers. So the actual difference between the two is less than more. Cantonese are only a portion of the Character set, the most are sill standard Chinese characters. Cantonese is a Chinese dialect. With its own character set used for expressing spoken Cantonese, versus standard Chinese. It's technically incorrect to say, "I speak Chinese," without adding a dialect. And one can only say, "I read Chinese." Learning to speak Cantonese with a foundation of Mandarin is very easy. But in the beginning it may seem difficult. It's really no different than learning French if you speak Italian, or Portuguese, if you speak Spanish. The similarities are many and there are many transferences of sound. The differences are easy to maneuver. I lived in Chinese regions for over 20 years, speak and read Mandarin with near-native fluency, hold a BA from a Chinese university (Sadly, italki won't let me teach here. 天不怕地不怕只怕老外说中国话). I learned to speak conversational Cantonese in Hongkong and Shenzhen. But I didn't put much effort into reading Cantonese characters, outside of recognizing the most commonly used ones, since news papers are all in standard Chinese.