What are the best tips that should i follow before the salary negotiations?

First of all you need to be sure that you are being hired. You should have done your homework in finding out what others in the company earn for a similar position & also in other companies. Secondly consider what you were earning in your previous job because you must be in a position to ask for-% more. In case you can ascertain how badly the company requires your expertise you could negotiate for a higher salary package.