[omarhaneef]

You may have heard people say that “business” is not a deep discipline and I think the theory of business is pretty accessible.

Go to any business school site and just look at the MBA curriculum:

https://www.hbs.edu/mba/academic-experience/curriculum/Pages...

I would then focus on the introductory courses (typically Accounting, Valuation, Marketing, Org theory etc).

Find the syllabus for those courses or the text book and just browse it.

That won’t teach it all but it will sort of give you a map of the territory so you can look it up when you need to. About the level of memory most MBA grads have 5 years after graduation.