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@fschuttkowski I don't know of a single entry point, but there are quite a few resources out there. First, Micro.blog is hosted Hugo with many bells and whistles and extra features sprinkled on top. So Hugo resources, like the docs, are good references to have at hand. And, of course, the official Micro.blog Help Documents. There's also the community project, How to customise Micro.Blog, with plenty of resources and links.
And if you have a Micro.blog-specific theming question, a few of us plug-in and theme developers hang around over at the Help center forum and try to help each other when we get stuck. 😊