Port knocking is mostly a bad idea. But people keep wanting to do it, for some false sense of security. If you don't consider it a security control but a way to keep garbage out of your logs, it might be valid. Here's one way to do it with OpenBSD's pf. More..
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tl;dr: On Unix-like platforms, if you use git clone --recursive on an untrusted repo, it could achieve remote code execution. Update to a fixed version of Git and other software that embeds Git (including GitHub Desktop).
However recently it added a killer feature: generated columns . (This was added in 3.31.0, released 2020-01-22.)