Which skills do i require to be an better ui developer?

To become a UI professional start with basics of Web developement technologies : HTML5,CSS3,JavaScript,jQuery. After that start developing pages with the mentioned skills,later learn how to do responsive web applications, that can be achieved by CSS media queries and CSS framework : Bootstrap ,Foundation , you can learn anyone. And then comes Javascript frameworks : Angular,Vue,React,Meteor,Ember etc..

The Ultimate goal is develop SPA Applications. Have a good learning,all the best :-)

First start with a Paper and Pen draw a rough sketch of a website, find the difference between Header, Navigation, Content area, Footer. then start with HTML5 and CSS3 try to code your design drawn on your paper, find the difference between web sites UI as well as Mobile applications UI, step by step you will find the answers for the questions you get in the process of learning, Don't forget internet is your friend in learning.

These are the required skills for a developer...

•Basic knowledge of HTML and CSS.

•Core knowledge of (PHP, MySql); (Jquery, Ajax).

• The other main thing is a framework, There are many frameworks available but these two are best (.net and laravel) my recommendation is for laravel because it's easy, fast and latest...

So, you want to be a better UI developer? Hence I consider you are good with HTML, CSS, Javascript. 

You might want to learn the latest CSS 3 features like Flexbox and Gridbox that are changing the responsive web design development scene. You might want to try out the other features like keyframes and gradients as well. 

Practice as much as you can. That is the key to get better. Take a 30 day challenge where you will create a complete web page. Analyze your code.

Start freelancing. You are good if somebody is willing to pay you for your work. 

Learn SASS/LESS and the need to use them.

If you got more questions, do post it here.