When I got started, I had a "share everything I learn" mindset. I ran a blog called pv3d.org +10 years ago that was chock-full of 3d code demos. I started turning those into video content over time and then that eventually turned into egghead.
To get started, share something, anything, the smallest possible thing that you can think of. Be consistent with it and "get your reps in". It gets much easier the more that you do it and you'll gain the confidence to share bigger and bigger things.