Firebase is a mobile and web application development platform that provides various services such as authentication, databases, storage, hosting, etc. To log into a new user on Firebase, you need to follow the below steps:
1. Create a Firebase project and set up Firebase Authentication.
2. Choose the authentication method, such as Email and Password, Google sign-in, Phone number, etc., that you want to use.
3. Call the appropriate method to create a new user account using an email and password, phone number, or other chosen authentication methods.
4. After a successful creation of an account, Firebase SDK will return the user's unique ID token that you can use for further authentication and authorization.
Note that you should ensure secure and robust user authentication in your Firebase application to protect data privacy and prevent unauthorized access.