Where to take caregiver classes?

Find the name of the job you want to be hired for and see what the job postings require for training & education. E.g. Personal Care Assistant, Resident Assistant, Health Coordinator, Direct Support Professional. The internet is full of job descriptions and prerequisites.

Look to your local county Area Office on Aging (not sure what it would be called in your county). They may have caregiving classes.

Larger Senior centers often have classes on dementia caregiving. Also hospital community education departments have support groups (very educational) and classes.

Call AAA Homecare in Nevada. Many agencies offer training and certification. It's actually a good way to find out if you really want to make this a career.