In the process of developing my website, I am using PHP7, HTML5, CSS3, JQuery, and JavaScript5 instead of WordPress. One feature that I want to incorporate is the ability for users to customize their theme beyond the default option. How can this be achieved? Would it involve creating a drop-down menu with different CSS stylesheets or is there another method that should be used?
Any feedback on this inquiry would be greatly appreciated, as previous questions have not been received well. Your input will help me improve and clarify any unclear aspects.