Hi Serge, welcome to Node-RED and the forum.
Right off I recommend watching this playlist: Node-RED Essentials. The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot more in about 1 hour. A small investment for a lot of gain.
There’s a great page in the docs that will explain how to use the debug panel to find the right path to any data item.
Pay particular attention to the part about the buttons that appear under your mouse pointer when you over hover a debug message property in the sidebar.
https://nodered.org/docs/user-guide/messages
Next, when you posts flows, in order to make code more readable and importable it is important to surround your code with three backticks
```
like this
```
You can edit and correct your post by clicking the pencil icon.
See this post for more details - How to share code or flow json
Don’t worry about your first post, we’ve all been there and we all started at the beginning. The more you play and experiment, the more you will learn.
Once you have watched the videos and read the other material, see what you can do and if you are stuck, ask your questions.
