Experience is what it takes to know how to accomplish the something with less effort because of lessons previously learned.
What you learn and experience can often determine your success or failure. Effortful learning combined with real-life on-the-job experience is a winning formula for success. Your choices and your experiences help create the person that you are.
Sharing an experience within the context of the lecture or advice consolidates learning, fosters better understanding, and impresses longer in the minds of students or those having the experience. It simply puts theories to practice firsthand.