What are the important things which i have to add in my Resume?

your Educational background along with your experience and what exactly your job responsibilities there. Add only necessary information. One more thing u can add is your expertise and skills  related to your field and additional certifications of achievements,workshops/ training if u have any.  

In my experience in being on both sides of the hiring process, listing quantifiable accomplishments stands out the most. Any one of us can show up to our work, get our job duties done, and go home for the day. What hiring managers want to see these days are what you did to make your workplace better. Did you do something that saved the company money, brought in additional revenue, improved the efficiency of a process, reduced errors or defects in a process, improved quality?

Think upon your past jobs, look for things where your bosses or peers made positive comments on your ideas. When you list accomplishments, try to work in key skills into your statements. This will help keep your CV size down as well as help ATS systems pick up on your CV.

Example: Instead of saying in your current job, worked on Windows Server 2012 servers, say "Using Windows 2012 Server skills, reworked the domain controller with redundancy resulting in zero downtime for the company." This statement lists not only technical skills, but what you did with them for the benefit of the company.

If you have a hard time finding accomplishments in your past role, now would be a good time to step up at your current job and start working on accomplishments. Even small accomplishments can help your CV stand out in a crowd.