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This question is about resume.
To say you trained someone on a resume, list it as any other job responsibility and/or skill, and use action verbs in your description.
On your resume, list your job title associated with the training you performed, dates of employment, and job responsibilities and accomplishments underneath.
Underneath the job title is where you want to include that you trained someone. Try to use action verbs to describe this, like coached, trained, or mentored. Then go into the specifics of the training.
If you can provide hard data that backs up your training abilities, like "resulted in a 75% increase in consumer satisfaction", definitely do this. Information like this is likely to spur your potential employer's interest in you as a candidate.

Zippia allows you to choose from different easy-to-use templates, and provides you with expert advice. Using the templates, you can rest assured that the structure and format of your resume is top notch. Choose a template with the colors, fonts & text sizes that are appropriate for your industry.