Intro-section with dropdown-navigation-menu #responsive #JS

I am learning coding for 07 months. I found CSS a little bit of time talking. I have used vanilla javascript. In but future I will use react.js. Otherwise, the project is quite easy.

I think I am using too much CSS. Can it be minimized?

I have seen many tutorials and videos. I am unsure about the best practice of coding.

Please help me with feedback on my project (01 to 10) with details, so that I can understand how much I learned.

Thanks, everyone.