Frontend Mentor - Fylo dark theme landing page solution

This is my solution for this project, I will appreciate if you can provide some feedback to me.

I can say for example, I found a little bit difficult planning this project I was not sure if I needed to complete the HTML part first and the continue with the styling, or do both at the same time, What is the approach you guys implement? and What best practices should I pay more attention to?

Best Regards