The differences between Cantonese and Mandarin are as follows：
1. Different syllables
Guangzhou dialect retains a lot of ancient Chinese elements and uses monosyllabic words while Putonghua mostly uses dissyllabic words. Mandarin has warped tongues zh, ch, sh, r, while Cantonese does not; Cantonese has a nasal vowel ending with m, as well as vowels ending with b, d and g (i.e., entering vowels), while Mandarin does not.

2. Different grammar
The word order is different, "me first" in Mandarin and "me first" in Cantonese.
Function words are different, Mandarin "I am reading", Cantonese "I am reading closely" and so on.

3. Different cultures
Putonghua is a modern standard Chinese with Beijing pronunciation as the standard pronunciation, Uttar Pradesh (Mandarin) as the foundation dialect, and modern vernacular works as the grammatical norms.
Guangdong has its own unique culture since ancient times. At the same time, it opened to the outside world early and absorbed a lot of Western culture, which further diversified, broadened and deepened Cantonese.
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