I want to take data from html page(Login page) to sqlite DB like username, password so what is the procedure and code i need to use?
Welcome to the forum @Ketul
Start at the beginning and work out how to get the data from the web page. You can use the html request node for that. There are examples in the node red cookbook site.
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.