Being able to find common ground with someone allows for a few different things;
- It can help you reach a compromise when there is conflict
- Common ground allows for more discussions and agreements
- It can help you make friends or be social with other people as you will have "common" things to talk about
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.
- Heather