Intro Section with dropdown nav

I created this with bootstrap, and this is my first project using studio. any pointers would be great this is not my final solution.

I struggled with making the hero section centered and keeping the image smaller while having it aligned with the text. any tips to better understand how to keep the elements lined up together?

Bootstrap's dropdown menu also has this underline decoration, but when I set it to none it remained.

Lastly I realized I need a sidebar for the mobile design.