When people give advice to content creators in the form of "when you do interesting things" my brain immediately jumps to one question; how do you know what other people consider interesting?

Honest question, because I am just starting out, myself. I have a small blog where I share my opinions and projects related to technology I enjoy. However, if I were to do a thought experiment and assume my audience is HN readers, I'd hesitate to say anyone here would find my posts very interesting. I like them, but I am not sure who else would.

I genuinely do not understand how to evaluate an audience, so I just write what I like to write and hope for the best.