About Conflict

How to be friendly ?
How to solve problem between each other ? If someone's opinion is diffirent from you, what would you do ? In my childhood, I don't know how to get along with others. So I usually fighting with others, but I'm better now.
There is many kind of conflict, about your relationship or between yours messenge having problem. But conflicting and fighting is happening everywhere, the only question is "how to solve, how to avoid" even though may fight or conflict isn't bad things. It could make somebody grow or be stronger.
I still learning this, and I am not a gennis , I also hope somebody could telling me answer.