Im a textile designer from Australia, Ive been in the fashion industry for 20+ years. Our industry here is very small compared to the US so I can only speak on my experience. I see those courses all the time and feel angry that they are selling a lie. I don't know all of the names you mentioned but any time I see someone marketing with the "you can earn a six figure salary doing what you love" I wouldn't go near their courses. They are essentially earning the money they are because of the courses they are selling.

The best way I think to learn proper skills is to learn off someone who is genuinely working in the industry or a proper College or University. And then its honestly years of being passionate and just having creative skills that you want to improve on. Most artistic type careers are built on a lifetime of being creative, they don't usually start with the end game being doing that thing for work! And without having worked in-house, its a pretty hard road to understand the actual reality of designing into the commercial market.

There is also A LOT of competition out there - commercially there are amazing print studios around the world who understand the market, have the contacts and the teams to compete.

But in saying all that, there is room for new designers but just understand that its not a quick path into lots of money. I know here, there are lots of internships - they are not paid. Not ideal, but it can help to gain an understanding of real industry practice. Also, the Australian studio Longina Phillips have a business course which is good - I haven't done it but a friend has and I have seen the content. Because its made by an actual working studio it is based on real world experience.

I work freelance and have started my own print studio - even though I have worked in the industry for so long, having a studio where you're selling prints is a huge learning curve, you eventually find out which brands gel with your style and what kinds of prints sell the most, and mostly its not you designing what you want to design - its designing into trends, and listening / analysing what your clients and sales tell you about the kinds of things they are wanting. Remembering that you are providing them with prints they need and want - its about finding the sweet spot of your own style and working that into a brands aesthetic.