Optional Section: Coursework & Credentials
It's absolutely unnecessary to say you've taken Management 101 or taken one class about Computer Networking.
However, if you've taken coursework specifically to be certified or required for a job, then definitely mention this under "Education". See this example:
If you've taken a few seminars or workshops where your boss sent you to learn the field, then simply indicate those under "Summary of Qualifications".
For instance, you've attended seminars regarding hiring & retention, crisis management, and labor law updates, you can add this as "Seminar training in Crisis Management, Hiring & Retention, Year Labor & Employment Laws."
There is no need to take up space and have a separate section of just course names.