What is important to one person can be unimportant to someone else. Respecting others is what is necessary and you need to know what is important to them. It could be as simple as knowing not to call after 9pm. Even the little things can have a high value to someone.
For me, what is important is having the opportunity to write when I have the thoughts flying around in my head. To someone else that doesn't think writing is important won't understand the importance to me.
Understanding those around you and what is important to them can make a big difference. To some people having tons of friends is important while others just having a few really good friends is important. Knowing and respecting what is important to those around you can make a big difference.
What is really important to me is knowing what is also important to those close to me.