Yes-man What is a female variant for "yes-man"? If there is any...

What is left-hand break in the context? I'm reading a book and cannot undersnad one phrase: The author is in New Zealand in a beach-house, and he says "what surfers tell me is the best left-hand break in the Southern Hemisphere". I know what is left-hand break on the bike. What can it mean in that context?

Which preposition should we use with the word"margin"?I mean margin for/on goods,when we buy for $1-sell for 2

Is it possible to say "I don't know onions in marketing"? I'm not sure about using an idiom.

Hello World A cat in gloves catches no mice. A fool's tongue runs before his wit.