Where can someone go to learn about boats?

I have a long term plan to start a company involving boats of all types, and I’m wondering if any boating enthusiasts have a recommendation on how I can get to learn the inner workings of all boats, how to repair them myself, and overall knowledge of the different vessels.
The boats would be what I would call pleasurecraft. Basically anything even remotely related to watersports, from ones that pull waterskiiers to catamarans to speed boats and even possibly larger models for cruising.

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