How do I properly use curl --post to send data in a request? or What's the correct syntax for curl --

Ah, the classic curl --post struggle! Your syntax is *almost* right, but it's actually `curl -X POST` instead of `--post`.

Try this:
`curl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' http://example.com`

For silent fails, use `-v` for verbose mode—it’ll spill the tea on what’s going wrong.

And yeah, curl --post (well, -X POST) is mostly for APIs, but you can use it anywhere you need to send data to a server.