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Blogs are static. Digital Gardens are evergreen.
A Digital Garden is more like a wiki than a blog. Instead of writing a perfect blog post that is impeccably crafted and wholly expresses a single idea, you can take notes and musings on whatever things you're thinking about. Or things that are in the news or being debated. Things you've always wanted to share your opinion on, or stuff you're working on.
The way it works is not technical, the technical part doesn't matter at all. The point is the mindset shift, of thinking of your Garden as something that's living, that changes. Nothing is ever finished.