Great advice! I think it's important that you write for yourself as well as for your readers. You mentioned in the first point writing forces you to flesh out your opinions. Part of having a blog is to chronicle your journey. I've found it invaluable (and slightly embarrassing) re-reading old posts and seeing where I've changed.
Also, shoutout to Medium as another blogging platform. It's a really easy way to get started with writing. It also looks beautiful. Downsides are no markdown and it's not self hosted.
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