open-access course
nounUK /ˌəʊpən ˈækses kɔːs/
US /ˌoʊpən ˈækses kɔːrs/
A class you can join for free without special permission.
She learned to code by taking an open-access course online.
OTHER MEANINGS
2. A university class open to anyone, not just enrolled students.
The professor offered an open-access course on astronomy to the whole town.
3. A course whose materials are shared freely for anyone to use.
The open-access course includes free textbooks and videos.
4. A training program with no entry requirements or fees.
The library runs an open-access course in basic computer skills.