How do I make a block that pulls the current node content?

Ok, so I know blocks in Drupal 8 have these things called “contexts” which allow Core to clear cache on a fine-grained basis. I can’t find any decent explanation of how they work, or how to get page variables from them or whatever.

My goal is to have a block type that renders fields or a display mode of the current node into the block content. I have seen elsewhere how one would get the current node, but I don’t entirely understand how it’s supposed to feed back into cache contexts. I know #cache on render arrays exist, but there’s also a bunch of methods from ContextAwarePluginInterface that I’m not sure what they do. Is there some documentation I’m missing?

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How do I make a block that pulls the current node content?

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