User Interface or UI for short and User experience UX for short.User Interface is the part the user sees or interacts with often called frontend.It doesn't matter if you use node or python as backend language.The only thing users care about is how your website feels,how easy is it to use your site ,they describe it by looking at and using your website.

Best Practices for Designing an Interface
1.Keep the interface simple
2.Create consistency and use common UI elements
3.Be purposeful in page layout
4.Strategically use color and texture
5.Use typography to create hierarchy and clarity
6.Make sure that the system communicates what's happening
7.Think about the defaults.
8.Think like an user:
Like you don't know how anything works, you just want good experience and get things done when needed

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