User interface design aims to create systems that are usable and adaptable to changing user needs. Good UI design considers principles of layout, color theory, and negative space while ensuring visibility of system status and directing attention to important elements. Forms and input fields should be automatically focused to improve usability. Error messages should be polite, consistent, and constructive based on the user's background and experience.

1. Graphic and Web designer/SEO

3.  User interface design or user interface engineering is the design of
computers, appliances, machines, mobile communication devices,
software applications, and websites with the focus on the user’s
experience and interaction. The goal of user interface design is to
make the user’s interaction as simple and efficient as possible
 Graphic design may be utilized to support its usability. The design
process must balance technical functionality and visual elements
(e.g., mental model) to create a system that is not only operational
but also usable and adaptable to changing user needs.
 user interface concept of designing an interface through which user
can interact with the product,

4.  People (mostly) use apps because they’re useful, not because they
look pretty. But that doesn’t mean you can ignore good UI design,
or just slap together a generic-looking user interface. Good UI
design adds to the overall user satisfaction of any web app.
 Good UI design is, in many ways, similar to good web design.
Principles of color theory, negative space, and layout all still apply.
But UI design requires a bit more thought in many cases due to the
interactivity it requires.

5.  One of the most significant elements of a good user interface is
visibility of the system’s status. Users must notice immediately
what’s going on behind the scenes and whether their actions have
actually led to the expected results

6.  Color can also be used to effectively focus your visitors’ attention
on important or actionable elements.
 For example,
 websites had the donation button colored red. Red is a very bright
and powerful color so it attracts attention, and it stands out even
more when the rest of the website is blue or another colder color.
 example of websites that use color effectively to direct users’
attention to the important elements:

8.  Many Web applications and websites feature forms. These may be
search forms or input forms inviting you to submit something. If this
form is the core feature of your application or website, you may
want to consider automatically focusing the user’s cursor on the
input field when the website loads. This will speed things up
because users can start typing right away without having to click on
it. A good example of this is Google and Wikipedia’s websites.

9.  As web-sites provide both static and dynamic content, some
aspects of the user interface attract attention more than others do.
Obviously, images are more eye-catching than the text — just as
the sentences marked as
 The human eye is a highly non-linear device, and web-users can
instantly recognize edges, patterns and motions. Bold are more
attractive than plain text.

10.  Limited short-term memory
› People can instantaneously remember about 7 items of
information. If you present more than this, they are more liable
to make mistakes.
 People make mistakes
› When people make mistakes and systems go wrong,
inappropriate alarms and messages can increase stress and
hence the likelihood of more mistakes.
 People are different
› People have a wide range of physical capabilities. Designers
should not just design for their own capabilities.
 People have different interaction preferences
› Some like pictures, some like text.

11.  Error message design is critically important.
Poor error messages can mean that a user
rejects rather than accepts a system.
 Messages should be polite, consistent and constructive.
 The background and experience of users
should be the determining factor in message
design.