This is a great question! So many newbie entrepreneurs jump into a business simply because they are good at building a product but don’t realize that business in itself is a science or art that needs to be understood.

That’s your key – understand what business is all about and in my opinion you already have a good start by asking.
My answer to you is that it depends.
You didn’t mention what type of business you are, but that hardly matters because in business you have to be a sales person – are you a natural social person? Are you capable of listening to feedback without preemptively making your own assumptions or judgments? If you are this could help you create a better product that will have early adopters, it could help you build a team easier than those who aren’t social.

if you are able to build a team and is feasible to get one – you should focus on getting people who compliment your own skillsets. Don't try to thin yourself out by trying to learn every aspect of a business operation when you can easily find someone else really good at that who can join your team.

Is like what I tell businesses – if is not in your core business, outsource it.
For an entrepreneur this remains true, if it doesn’t directly help you reach your goal, outsource it don’t spent time learning it when you can hire someone to do something while you do what you do best.

Consider also, what it is that you want to learn? How form the company? How to calculate cycle times from raw materials to final product packaging? Balancing a ledger? How to run a regression model? Or a financial analysis? All this you can hire someone when, if, you get to that point.
If you have a product or service in mind, simply promote it – make a few sales and that need to fulfill your commitments will lead you with what you need to get them done and deliver.

Leverage google, clarity and YouTube if you are too shy to simply send a local business owner in your field for some feedback or mentoring…

Also consider that the money and time you would spend in a class are valuable resources that should be going to building your business.

I hope that gives you a good idea of what approach to take, if you have any further questions just send me a message and if you are looking for a website done, a marketer or business coach, well also send me a message :)

Humberto Valle
Unthink.Me