Create a node using the REST API
Okay, I am going to Explain you in a very simple way using a Postman Software. 
 1. Enable the restui Module. 
 2. Add the basic_auth authentication.
 3. Get the X-CSRF-Token from /rest/session/token.
 4. Follow things by this image:



 5. Add the following text into your Body.




And hit the Send Button Its Done!