TIL there is an online publication from Harvard called "Misinformation Review"

https://misinforeview.hks.harvard.edu/

This worked for me to create a self signed certificate for nginx:

openssl req -x509 -newkey rsa:4096 -sha256 -days 3650 -nodes \
-keyout example.key -out example.crt -subj /CN=example.com \
-addext subjectAltName=DNS:example.com,DNS:example.net,IP:10.0.0.1

Taken from here:
https://stackoverflow.com/questions/10175812/how-to-create-a-self-signed-certificate-with-openssl/41366949#41366949

"Welcome to the Caddy 2 web server. Configure it by POSTing the configuration to itself"

- head spins -

Wouldn't surprise me if the next doc page says: "You tell Caddy it is a web server by pointing it to itself. It also gains self confidence this way."
https://caddyserver.com/docs/getting-started

In Metalsmith.js plugins, you often see a "setImmediate" call first with the done function as argument.

I thought it a bit confusing that you call done the first thing you do. It turns out it executes after the rest of the code in the function it is called from. Tested by me now. At least unless there are calls in there that might slot it in, such as setTimeout() . Gotta check it, hmm turns out the called code in setTimeout is still called before the setImmediate code…
https://flaviocopes.com/node-setimmediate/

I had two different user sharing a directory structure with the setgid bit. However when one user created the directory, the other user could not write to it. The other way was no problem. The both share the same group.

It turned out the difference was in the users' umask. One had the umask of 002 which allowed for write permission for group to go through, the other one had the more conservative 022 and that blocked write for the group.

One solution is to set umask 002 directly in the terminal