Definitely an important skill, early on I'd try to say yes to everything to explore all opportunities, but you quickly feel in practice that time is the most scarce asset, and to be focused it involves a lot of saying no.

Thanks!!

Are there things you say No to to stay focussed?
Steve Jobs said you should say No to almost everything except your big goal.

Do you practice something like this habit of saying No?

Storyteller

Project management software and getting proper sleep/time at the gym.