there are 4 reasons making conflict:

1. Goals. each person has each different conflict. Conflict can happen as a result of conflicting goals or priorities.  It can also happen when there is a lack of shared goals

2. Personality conflicts.  Personality conflicts are a common cause of conflict.  Sometimes there is no chemistry, or you haven’t figured out an effective way to click with somebody.

3. Styles.   People have different styles.  Your thinking style or communication style might conflict with somebody else’s thinking style or their communication style.  The good news is that conflicts in styles are easy to adapt to when you know how.

4. Values.  Sometimes you will find conflict in values.  The challenge here is that values are core.  Adapting with styles is one thing, but dealing with conflicting values is another.  That’s why a particular business, group, or culture may not be a good fit for you

Your post is very useful and valueable, if you dont mind i will add more 2 other cause of conflict. 
Communication: If you reflect back upon conflicts you have encountered over the years, you’ll quickly recognize many of them resulted from a lack of information, poor information, no information, or misinformation. Let’s assume for a moment that you were lucky enough to have received good information, but didn’t know what to do with it…That is still a communication problem, which in turn can lead to conflict. Clear, concise, accurate, and timely communication of information will help to ease both the number and severity of conflicts.
Emotions: Another common mistake made in workplace communications which leads to conflict is letting emotions drive decisions. I have witnessed otherwise savvy executives place the need for emotional superiority ahead of achieving their mission (not that they always understood this at the time). Case in point – have you ever witnessed an employee throw a fit of rage and draw the regrettable line in the sand in the heat of the moment? If you have, what you really watched was a person indulging their emotions rather than protecting their future.

thank you for your advice :Dyou are welcome ^^