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1. What is a good thing to avoid in mobile UX?
2. What are the best practices for mobile padding?
3. What is one of the most important aspects of mobile UX design?

What is a good thing to avoid in mobile UX?

Don't replicate the web experience on apps

Mobile apps designed as web experiences feel awkward and unnecessary — not because they have issues with usability, but because it's simply different from what users expect to see. Practical recommendation: Avoid using underlined links in mobile apps.

What are the best practices for mobile padding?

For mobile devices, the ideal padding is somewhere between 13 - 15 pixels. For tablets, padding looks best around 20 - 24 pixels. For desktop, padding is best starting at 24 pixels and progressively wider for larger screens.

What is one of the most important aspects of mobile UX design?

Put the User First. This should go without saying, but in any design project, the user should always come first, and user needs are even more important (and more specific) on mobile devices. If designers don't cater to mobile users' needs, those users will very quickly move on to other websites, apps, or distractions.