[anthonyhn]

> But I always find I have nothing to speak about.

Odds are you do have something interesting to speak about. Many people are experts in very niche things and don't even realize it. You may be very proficient with a niche piece of software that is not well documented, or may have created software to solve a very specific problem. Writing blog posts about your niche knowledge can be tremendously helpful; I can't tell you how many times a single blog post about an obscure problem has saved me hours (possibly even days or weeks) of research when I've encountered the same problem.

[ativzzz]

I feel like I never understand anything well enough to tell other people about it - the bare information I have can easily be acquired by anyone else without reading anything I write so my writing is a waste of time (when it comes to writing for other people anyway)

[alpaca128]

Everyone learns things in a different order and in different ways, so an alternative explanation or source of information can still be valuable. Sometimes I have an important realization simply because something I'd already known for years was presented from a different angle, or maybe just because I rediscovered it in a more fitting moment of my life.

And if someone doesn't find it useful, well, they'll just stop reading and go somewhere else.

[xenodium]

Often writing for yourself (“how I did x when I didn’t know how”) is useful enough without being an expert on the subject. You can refer back to it later on if you forgot how you did it, or someone else who was in your shoes will appreciate it. Also makes things less daunting (“hey others are going through the same as me”).