What is best of luck?

"Best of luck" is a common phrase used to wish someone success or good fortune, especially before they undertake a challenging task, project, or event. It's often used in various contexts, such as before exams, job interviews, competitions, or any situation where the outcome is uncertain and one's performance can make a significant difference. This phrase is a way of expressing support and encouragement, showing that you care about the person's effort and hope for their positive outcome. Similarly, in different cultures and languages, there are equivalent expressions that convey the same sentiment of wishing someone well in their endeavors.