First SCSS Project! Help is needed! Please!

This was my first ever SCSS project and I had a huge problem installing it due to my Mac showing errors about administration. If anyone has an idea to what is going on, please help me.

I also couldn't deploy my site on Netlify for reasons I don't know. Is there something I am supposed to do when deploying SCSS projects?

How was I supposed to change the colour of the Logo svg at the bottom because I tried fill: red; and it didn't work and nothing else worked!

How good is my html layout? I tried to make it as semantic as possible.

Any other feedback appreciated.

Also how do I do the underline under the learn-more link??