There are things in life that are important. There are many others that are not. Sometimes it is hard to tell the two apart. Success and happiness in life oftentimes depends upon our ability to tell which is which.
I categorize the unimportant things as petty things. Do not waste time on petty things as they will sap you of energy, opportunity, and happiness. Focus on what is important... What is important you might be asking as you read this.
You decide what is important. No one else can decide for you. That is not to say that many won't be telling you, advising you, preaching to you what you ought to consider important. Listen to them, think about it, then decide for yourself.