[theamk]

This can be complex sometimes, but in case of HTTP methods specifically, it's hard to imagine how one can't know about this.

You learn HTML (and see a mention of "POST" method); or read HTTP primer (and see reference to methods) or open browser inspection window and see prominent "Method" column, or see the reference in some other place. You get interested and want to look it up - say wikipedia is often a good start [0] for generic part. And the second sentence of description says it all:

> GET: The GET method requests that the target resource transfer a representation of its state. GET requests should only retrieve data and should have no other effect.

[0] https://en.wikipedia.org/wiki/HTTP#Request_methods