One of my favourite small details about PostGIS is the way that the documentation includes visual representations of what various query operators achieve. Here

One of my favourite small details about PostGIS is the way that the documentation includes visual representations of what various query operators achieve. Here are some examples for ST_Buffer: https://postgis.net/docs/ST_Buffer.html#idm15238 https://postgis.net/docs/ST_Buffer.html#idm15238