What is a good practice for sign-up forms?
Wherever possible you should avoid gating features behind login. The best sign-up form is no sign-up form! By asking a user to create an account, you come between them and what they're trying to achieve. You're asking a favor, and asking the user to trust you with personal data.
How do you describe a sign-up page?
A signup page (also known as a registration page) enables users and organizations to independently register and gain access to your system. It is common to have multiple signup pages depending on the types of people and organizations you want to register.