I had a group project in uni where I didn't quite grasp a concept. One member of my group sat down with me for a good hour and we went through a few examples until I understood everything. I remember being very thankful for that.

I had the opportunity to pass along the kindness when my group were working in a room where one guy needed help with his programming project. I saw that he didn't understand a few basic concepts so his whole program was fundamentally flawed. I explained to him why it wasn't working and what he needed to do. In the end he got it working and was pretty happy!

Not a huge thing but it meant a lot for me that something took their time to help me when they didn't need to and seeing someone succeed after my help was a nice feeling too.

Thanks OP!