Writing a Resume is a challenege for many, and the simple reason is people often are not sure on how to present their qualifications and experience in a page or two.
Here are some simple tips that will help you:
1) Always draft/customize your resume, based on the skills required for a particular job/ application (admission, scholarship etc). Try to avoid a generic resume.
2) Be clear in what you write and try to make it crisp and avoid unnecessary lengthy sentences when you can do away with a shorter one.
3) Do not write in passive voice wherever possible.
4) Avoid or minimize usage of personal pronouns (e.g. 'me', 'I', 'mine').
5) Avoid mentioning generic interests (e.g. 'travelling' or 'reading'), if they are not adding any value to the resume.