DIY workshops/courses/volunteering in Los Angeles?

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Hey fellow Angelenos! I would like to learn how to do some basic home improvement work such as tiling, floor installation, floor refinishing, drywalling, painting, landscaping etc.. so I can apply it to my own future properties. I know Home Depot/Lowes have some basic workshops that may give some useful tips but I want to get my hands dirty and do some actual work to gain experience instead of hacking up my own home after watching a few youtube clips. I'm self employed and have no issues with time so I would like to use it doing something productive.

Are there any hands-on courses or workshops for such a thing in or around LA? Alternatively are there any places I could just volunteer? Would I need a license to volunteer for a general contractor on site?