@HKY12 . First of all you have to have an eye for it and have bit of experience in designing websites. Coding knowledge also helps. Then you should visit different websites for inspiration. Visit websites made by professional designers - look at their portfolios. There are also services that may audit your site and provide you feedback. Ask friends and relatives for feedback.
Look in the app center for some apps. You can also buy some third-party custom template that has more bells and whistle than plain Jane weebly templates
Good luck!
