Include measurable accomplishments such as “increased revenue by 25%” as well as responsibilities. It is easy to get carried away describing your work experience or responsibilities, but keeping it short is crucial. Once you get an interview, you will be expected to go into deeper detail.
If you have major gaps in employment, there are a few ways to make them less noticeable like a change of resume foramt. It is important to be honest about gaps in your resume and not try to cover them up, but to also make them seem productive and intentional. Adding volunteer work or classes in the time you were unemployed is highly valuable and fairly simple to get starter with.