Hello! I am new on the forum I like to know how to use nod red and make applications in home automation. I am a networker.
Take a look at flows.nodered.org where you can see all the different nodes available for Node-RED (so you can see if the things you want to control have nodes for them)
There are also flows listed that you can import into Node-RED to modify for your own use.
But when you start there are also some online tutorials to understand how to program in Node-RED https://duckduckgo.com/?q=node-red+tutorial&t=h_&ia=web
When you say domotic in the title, do you mean the home automation tool Domoticz, or “domotics” in general. If Domoticz, start with their wiki article about Node RED. If domotics/home automation in general, see the previous reply in this thread