Written documentation provides the strongest evidence: emails, text messages, notes about incidents with dates and details, and copies of any complaints you filed with supervisors or HR. Keep a detailed journal recording each incident with dates, times, locations, and witnesses present.Witness testimony is crucial – coworkers who observed harassment or noticed changes in your behavior or work performance. Medical records documenting treatment for stress, anxiety, or depression related to workplace harassment can also support your case and demonstrate damages.Start preserving evidence immediately. Company policies, job changes, or time passage can make crucial evidence disappear. If you’re still employed, save everything to personal devices – don’t rely on company systems. An experienced attorney can help identify what evidence will be most valuable and ensure it’s properly preserved for your case.