flyo-landing-page-with-two-column-layout-master/

Hey, this is a pretty fantastic solution! This is all I can say;

1. Consider adding a little interaction to the email submit button. You can use a simple email validation function to solve this or incase you aren't yet comfortable with J.S yet, in your html, add "required" to the input tag of the email.
2. For the accessibility issues, make sure that your heading tags are in sequential order i.e. (h2, h3, h4...), your document should contain only one main landmark, I recommend that you replace the second main landmark with a section or article. Lastly, your html elements should be contained in landmarks that means that all your divs, image tags, header tags(h1, h2...), buttons, etc. should be contained within landmarks like (main, section, article, etc.) When you fix accessibility issues, you make it easier for people that use screen readers to access/navigate your site.
3. For your html issues, I recommend that you omit the font-weight on the html tag, usually, it's recommended that all your styling is done in you css, it helps a lot then also consider adding header tags (h2, h3...) to your section tag. This is usually required when you use a section or article landmark. Otherwise, this is very good work, keep up the good work and keep on coding! Kudos!