complimentary course

noun
UK /ˌkɒmplɪˈmentəri kɔːs/
US /ˌkɑːmplɪˈmentəri kɔːrs/

A free class you can take without paying any money.

The hotel offers a complimentary course in yoga every morning.


OTHER MEANINGS

2. A class given as a gift or bonus with a purchase.

Buy a laptop and get a complimentary course in coding.

3. A polite or flattering lesson, often used humorously.

He gave me a complimentary course on how to dress better.

4. A free short program offered by a company to promote its services.

The gym's complimentary course attracted many new members.