Cantonese speaker here. These are Cantonese (the region) proverbs much like "Bob's Your Uncle" is a quintessentially British saying that Americans wouldn't understand.
On another note, mainland China (including Canton) actually uses simplified Chinese writing (which came out from the Deng Xiao Ping era) whereas Hong Kong specifically maintians the traditional writing. The difference is literally less strokes and simplification of the characters. The infographic here uses the traditional writing. Personally I feel the two writings are mostly close enough that people should be able to guess what the other means. And AFAIK, it's a 1-to-1 mapping anyway.