To write an effective resume, use fonts, headings and bullets to catch the reader's eye, and keep it to two pages. Instead of writing an objective, write a career summary, and cater the resume to the job applied for. Finally, outline job accomplishments, not just job descriptions.
Using the right keywords is an effective strategy when writing a resume. Most resumes are in digital form and are run through a program that search for those that contain specific keywords. If these keywords are not found, the resume is tossed away. To find the keywords to place into a resume, search the job description or ad for words, usually nouns, that could be keywords and place them in a resume for that job.
Another thing to do is to use action verbs when writing up job accomplishments. Action verbs clearly communicate things that were done and give the reader a vivid example of accomplishments.
Something not to include in a resume is hobbies, as they are unlikely to support the chance of landing a position. Also, don't include phrases such as "available for interview" or "references available upon request." Both of these phrases are taken for granted by the employer and it is completely unnecessary to include them. Finally, do not include negative information about any previous employer.