how to post something with curl code example

Example 1: curl post

curl --data '' https://example.com/resource.cgi

curl -X POST https://example.com/resource.cgi

curl --request POST https://example.com/resource.cgi

Example 2: curl pass data in request

curl -d "param1=value1¶m2=value2" -X POST http://localhost:3000/data