Reentrancy Attack in ERC-777 101

Hello, for some reason, when sharing the article, the post is blocked, but nobody can really give me much of a response. So, instead I'll add a bit of context about the article and share this link in a comment. I'm guessing maybe it has something to do with the URL.

In this blog, we describe reentrancy attacks in the ERC-777 standard. The ERC-777 is a standard for fungible tokens with a transfer hook. The exchange contract allows users to exchange ETH to SSSToken at a calculated rate.

This content is more focused towards devs and people who are interested in security, feel free to not read or comment if that's not your thing.