Completely Free: Courses and basic certificates are generally free.

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Alison (Some Free Courses with Free Certificates)

Alison offers a wide range of free online courses, and some in marketing and business include aspects of lead generation. They provide a free certificate for most courses.

B2B Lead Generation Techniques: Alison often has courses specifically on this topic. It's worth searching their platform.
Digital Marketing Courses: Many general digital marketing courses on Alison will touch upon lead generation for both B2B and B2C.
Why Alison?

Variety of Topics: A wide selection of courses.
Limitations of "Free with Certificate":

Depth: Free courses often provide foundational knowledge. For advanced, in-depth strategies or estonia whatsapp database very specific tools, you might need to consider paid options or further self-study.
Universality of Certificates: While HubSpot and Google certificates are well-recognized, certificates from smaller platforms or individual instructors might have less weight in the professional world.
Coursera/edX "Free Audit" (Important Distinction):
Coursera: Many Coursera courses allow you to "audit" them for free. This means you can access most of the video lectures and reading materials. However, you typically do NOT get graded assignments or a certificate unless you pay for the course or apply for financial aid.
edX: Similar to Coursera, edX offers "audit track" for many courses, which gives you free access to course materials but no graded assignments or certificate. To get a verified certificate, you need to pay.
My Strongest Recommendation for Free with Certificate:

Start with HubSpot Academy. Their Lead Management Course is tailor-made for what you're looking for, and their certifications are valuable for your resume. Then, explore Google Digital Garage for a broader digital marketing foundation.