Suppose I commented on a question asked. After I logout and login how to find the question for which I commented? Is there any link. (NOTE) Since I have not answered, the link to the question is not specified in the Answered section. Also if anyone has not commented back on the question, I have to fetch the HISTORY and then find the question.
You can use the recently updated Activity tab in your profile. It lists all* of your activity on the current site, and there is a filter to show only comments. From there you can find a link to the comment that you made, which will take you back to the question.
*All publicly available information, for the most part