Avoid jargon or any technical terms that most readers won't understand.
Avoid abbreviations or acronyms that are not commonly understood unless you describe what they mean.
Abstracts do not have a bibliography or citations.
Abstracts do not contain tables or graphs.
For most science projects, the abstract must focus on the latest research, and give only minimal reference to any earlier work.
If you are working with a scientist or mentor, your abstract should only include procedures done by you, and you should not put acknowledgements to anyone in your abstract.