You can think of Learning in Public as a habit of creating a "learning exhaust".

After you've learned or understood something - share your understanding - in a format that your past self would have found the most helpful. Use media format and words/concepts that make sense to you. Create something that you of 3 months ago wish existed!

• write blogs (and post them here!)
• ask and answer things here, on Reddit, etc. Prefer public spaces over walled gardens for this
• make explainer YouTube videos
• draw illustrations
• etc

See more discussion here