Several platforms offer free lessons or course materials. What is free differs from provider to provider.
Look for usable learning material
Choose a subject and look for explanations together with exercises, examples or assignments. A resource does not need a paid certificate to be useful for practising a skill; that does not make every free listing a complete program.
Distinguish access labels
Read whether the actual resource offers full materials, a sample, a time-limited option or a separate paid credential. The platform examples below are documented formats, not a claim that every item or certificate on them is free.
Keep your work independent of a badge
Suggested exercise: save notes and your own completed task, and cite the resource you used. Record unanswered questions so that your next resource addresses a specific need.
Documented platform formats
MIT OpenCourseWare publishes a free, open collection of materials from MIT courses. It is not enrollment in the corresponding MIT class. (Mit About — official documentation)
MIT explicitly states that it does not offer credit or certification to users of OCW. (Mit About — official documentation)
OCW materials can be browsed without enrollment or an account, and are not tied to a course start or end date. Materials can also be downloaded. (Mit About — official documentation)
Khan Academy’s official app page describes free, self-paced practice in math, science and other subjects. This statement concerns the core app, not every separately named AI service. (Khan Downloads — official documentation)
The app page describes interactive exercises, mastery levels and progress synchronization between app and web. (Khan Downloads — official documentation)
The official downloads page describes downloading videos to a library for offline study. This is not a promise that every exercise works offline. (Khan Downloads — official documentation)
Alison says it is free to study and complete its courses. A printed or digital certificate can be an optional purchase after completion; this should not be rewritten as every certificate being free. (Alison Free — official documentation)
Alison describes a free Learner Record showing completed courses and results for learners who do not purchase a Certificate or Diploma. (Alison Free — official documentation)
Alison describes its courses as self-paced and self-taught and states that it does not offer tutoring assistance on course content. (Alison How — official documentation)
Sources and access details
Official sources read 29 October 2026. Descriptions concern the named resource, edition, model or learning format. They are not independent product tests or guarantees of learning or employment outcomes. Check current access, price and terms with the provider.