Honestly, the best way to learn marketing is to build your own little Frankenstein project. Pick literally any product, slap together a janky site using Claude, design it with the same tool, then start throwing ads at it. Do a bit of SEO, try to make a reel that doesn't suck, and see if you can get any traction.
That's the real deal. I know it sounds easy to say, but that's genuinely the fastest way to become a half-decent marketer. Nothing else comes close.
The catch? You have to actually be driven enough to see it through. Otherwise, yeah, join a startup as a marketing newbie and learn the slow way. But compared to running your own little experiment, that's painfully slow.