Udemy
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Udemy runs a marketplace where independent instructors sell video courses on topics ranging from SEO to business strategy. Courses cost far less than university programs, typically under $100, with lifetime access once purchased. The catalog is enormous and quality varies, so read reviews before enrolling.
You'll find practical training on nearly any niche marketing topic, from Google Ads to email copywriting. It's ideal if you want affordable, focused training and don't need institutional credibility or a structured degree path.