It would probably be best to start organized and have an outline/roadmap of what you need to understand about the industry (biz model canvas, a checklist of key characteristics you want to learn about, etc). Day one, I'll start pretty high level and review whatever industry reports are available to understand the big blue arrows and speak somewhat intelligently about the industry. Then, start networking. Reach out to operators, employees, and advisors in the space and just set up calls. You could look up people here on Searchfunder, LinkedIn, industry organizations, and authors/teachers. Example, one time I was trying to learn about credit scoring/loan underwriting and found a technical manual on how to build lending models. I reached out to the author on LinkedIn and he became an incredibly valuable resource on the entire industry.

You'll learn something in each of those calls. Keep yourself organized and prioritize what you need to pull the string on next. Just keep pulling the string until you're satisfied with your understanding.

I would echo what Laura advises. Think "Who, Not How". Who has strong industry knowledge from whom you can learn? Perhaps talk to another business owner and pay them to shadow their business