you're really from Hong Kong. If you don't mind, may I know where you are based now?

Yes. Please see the rest in discord.

八卦是《易经》的基本概念，可代表一切自然現象的動靜狀態

Is about the origin which is an ancient philosophy - 《易经》的基本概念.

In modern-day use, it has become an expression equal to gossip.