Designing a mandatory input field with options

1. How do you set a field in mandatory form?
2. Is it important to clearly distinguish optional fields when designing a form?
3. How do you indicate a field is optional?

How do you set a field in mandatory form?

Required attribute: If you want to make an input mandatory to be entered by the user, you can use the required attribute. This attribute can be used with any input type such as email, URL, text, file, password, checkbox, radio, etc. This can help to make any input field mandatory.

Is it important to clearly distinguish optional fields when designing a form?

You should always try and avoid optional fields in forms. In the case you use optional fields clearly distinguish which input fields are required. Standard UX design, is to use an asterisk (*) for required fields and the word “optional” for non-required fields.

How do you indicate a field is optional?

The best way to indicate optional is to add the word in parenthesis after the label. It's easy to read and visually connected to the label that it is referring to.