Here is a link to offroad driving courses offered by a guy who got his start as an offroad driver in the mid 1990's wheeling with a group of us who used to hang at Jeeps R Us in Laguna Beach CA. His background is teaching in the corporate environment and as a PADI dive instructor. Most of his courses are a bit far from you, but he is a resource.
Also look for courses and workshops put on by 4x4 clubs and statewide 4x4 associations. Another resource would be the Overland Expo, which held both an east coast and west coast event pre-Covid with many seminars and hands-on classes. Don't know about now.
In California, the California Four Wheel Drive Association (Cal4Wheel) sponsors offroad driving courses throughout the year, some at Hungry Valley SVRA and some at Hollister Hills SVRA.
Here are more links: