Reply comments on your own post: Do this when a comment requires a response. You don't want to leave people feeling stupid for commenting on your post.

Replying to comments on one's post really works, when I joined steemit newly I was welcomed warmly but I didnt know because I didn't receive notifications from steemit on people that commented which made me reply after so many days😣😣😣. Thanks to @busy.org that gets me notified on any activity that goes on in my account 😃😃😃. Replying to comments also gets you new friends who will like to interact more with you.