The best UI practices for the web design

•         Use contrasting colors to make your form stand out of the whole UI of the webpage
  

Using different colors on different parts of your website will help the users to focus on the things you really want them to focus on. Selecting the contrast is sometimes the hardest part, so always place a primary and complementary color together that would make the actual object stand out. The brightness also needs to be differently set as like, using a light color contrast over a darker one

•        The Action Button should stand out
  

•         Make the form of the title an easy read
  

The only thing you need to understand from this is to make your user understand what will they get after the signup and the benefits that they will derive from it

•         Make the form easy and short
  

Use easy labels from the very start like name, last name etc. If a field is confusing then that needs to be said as an example inside the box, like, postal code- A2B 3CB etc. The mandatory fields need to be cleared with asterisk marks and explained below the form. You should also provide the user to have a social login for easier logins

The number of fields should be at the minimum and not increased to anything beyond what is required. You should always keep in mind that 95% of the users are not willingly providing you with their details so a longer one may bore them enough for them to leave it midway