This is a tough question for anyone to answer. But, the older you get, the more advice you’ve received. That’s my excuse anyway.
One piece of advice I remember came from an old-school draftsman who said “You get just as much to rub something out as you do to draw it. Don’t be afraid to make mistakes”
I’m sure I could think of many more wee gems. But, I’ll hand over to you to think about the best advice you have ever been given.