In order to write better CSS for styling websites you must first learn three things, which are responsive design, your code is maintainable and scalable, and is performative.

Responsive design is all about making sure your website looks and behaves perfectly on every possible screen size. Since the number of screen sizes is ever increasing, responsive design is a fundamental concept that every frontend developer must learn and master.

The code you write must be written in such a way that other developers can also easily understand it and contribute to it. This makes the code more maintainable and can easily scale if the scope of the project increases.

Use simple and meaningful class names and the markup should use semantic elements mostly.

The performance of CSS classes and styles can only be increased when you use the proper attributes and also use the latest available features to make your code more performant.

Systemize your code

Always use a system when designing from scratch, break each section into independent components that can also be used later on. Design with components in mind not layouts.

The BEM architecture is a great starting point for a systematic approach to CSS.

The 7-to-1 approach is also a good choice if your working primarily with large codebases and is not worth it for smaller projects. This approach outlines that you create seven different files for each type styling and then combine them into one single file.

Hope these tips help, if you have questions leave them in the comments and if you want to connect with me you can follow me on Twitter(X) or Linkedin: @syedumaircodes