Doing is the best way to learn marketing. Whether you are trying to create content to grow your business, learn PPC advertising, grow your social media channels, or promote your YouTube channel, you will learn the most by simply doing, testing, failing, and ultimately, succeeding over time. I learned the most when it comes to Pay-Per-Click Advertising by creating campaigns, creating ads, and doing that over and over again. You can learn marketing too by actually creating your own campaigns.
While I love that people watch my videos, and I still think that's an important part of learning the ins and outs of marketing, I think you will become a better marketer by testing, struggling, and learning. You don't want to waste your budget on ads, but you do want to test different types of advertising campaigns, different forms of marketing, and different things you can do to become the best marketer or advertiser.