What is the importance of user interface design?
Why is UI design important? Since users can only interact with your app or website through the UI, its design will determine their main impressions. If you've tried any low-effort app or website you'll know exactly how frustrating it can be to deal with a badly designed UI.
What should a login page have?
For a successful login page, you should use your email address/phone number as your login, enable social login, warn users that CAPS LOCK is enabled, and leave users logged in after login.