You could deliver the same content in the following ways (+ more):
- Always open online course (set & forget)
- Always open online course (with comments)
- Set timeframe course (with opening and closing dates)
- Website with member-only content
- Patreon-type sites
- Your own social network using something like Mighty Networks
- Your own course platform for just you (I’d recommend making it easy on yourself and using something like Teachable or Thinkific rather than WordPress + plugins)
- Your own course platform but you invite other instructors to join you and have your courses as a mini group
- A newsletter where you have free and paid content
- A course delivered over time via email (drip email marketing-style)
- Plenty of others