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Doesn't explain the g
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The provided image does not show gRPC, but RPC ( this will confuse beginners )

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The second image then has gRPC in it's title, suggesting that the "non-overall flow of gRPC" is already being explained.
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In the steps section, gRPC appears to be an active component that can do things. This opposes the previous (blurry) explanation that it's a concept rather than a thing.
// I'm trying to read the text from a beginners perspective and stay in brevity. I'm not trying to complain about the efforts :)