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Yes, there are many free digital marketing courses available online. Here are some popular options:

1. Google Digital Garage: Offers free certification in digital marketing, including search marketing, email marketing, and more.

2. HubSpot Academy: Provides free training and certification in inbound marketing, sales, and customer service.

3. Facebook Blueprint: Offers free certification in Facebook advertising and marketing.

4. Coursera: Partners with top universities to offer free online courses on digital marketing.

5. edX: Offers free online courses and certifications in digital marketing from leading institutions.

6. Udemy: Offers a range of free digital marketing courses, although some may require payment for certification.

7. Digital Marketing Institute: Offers a free introductory course in digital marketing.

8. Hootsuite Academy: Offers free certification in social media marketing.

9. SEMrush Academy: Offers free courses and certifications in SEO, PPC, and content marketing.

10. YouTube: Many digital marketing experts share free knowledge and tutorials on YouTube.

Keep in mind that while these courses are free, some may require payment for certification or advanced training.