I see. Well, it's always good to know which side your bread is buttered on.

知道了，嗯，能清楚什么对自己最有利总是件好事。

" To know which side your bread is buttered on" means you are aware of the people who can help you.

" To know which side your bread is buttered on" 意思是你知道什么是对自己最有利的事。