Do you have regrets in life? If you could go back, knowing what you do now, and make changes around them, would you? What if you had a 2nd chance to redeem yourself now?
As for myself, I have a handful. All of which are things I didn't do, not things I did.
Such as not spending more time with my dad before he passed away. Knowing what I do now, I would have cherished the time I had with him better and learned as much as I could from him, maybe I wouldn't have made some of the mistakes I've made since. One of the reasons I spend as much time as I can with my son now.
Not acting on how I felt about a person a long time ago. Cowardice and lack of confidence led me to be passive with my feelings instead of letting them be known. I would go back and do something about it if I could. Fortunately, fate has allowed me another opportunity with this person, and I'm acting upon it. I refuse to wonder anymore like I have the past 10 years.
Not going to college is another. Indecision cost me dearly here, as I was unable to choose what career path I wanted. I'm working on getting enrolled, I finally figured it out.
Those are the 3 biggest ones for me. Feel free to share some of your own, and what you would do, or for that matter, have done, to correct them.