https://www.luc.edu/writing/ - Loyola University Chicago's Writing Center has been working with Pre-Health students for many years to help draft and review personal statements. Beginning March 23, they will be available remotely for "online synchronous" and "written feedback" appointments, so we strongly encourage you to utilize their assistance, whether you are just starting to draft your statement or want feedback on a complete draft.
https://students-residents.aamc.org/advisors/help-your-advisees-apply-medical-school/ - in particular, watch the webinar "Ask Admissions Webinar: How to Present Yourself as a Strong Applicant"
https://students-residents.aamc.org/applying-medical-school/faq/what-parts-your-application-tell-medical-schools-2/ - to learn about how the personal statement/essay is one part of your application, but also to know that how you describe your "work/activities" on AMCAS/AACOMAS are important
https://www.adea.org/GoDental/Dental_Blogs/Advice_from_admissions_officers/Boost_Your_ADEA_AADSAS_Application_With_A_Resume.aspx - recommendations from a dental school reviewer about how to best prepare your "experiences and achievements" portion of the AADSAS application