From my point of view besides of it's height on preview project looks pretty fine. I think semantic HTML is fine but I don't like that you used button for Learning. I don't really thing that's neccessary and you could achieve that in other way eg. using P with display: inline-block and padding. You definetly need to practice with RWD but don't worry MDN got good guide for why and when. I'm also learning a new things brother, we all gonna make it :) I see that your CSS file looks kinda weird, but pretty similar to SCSS Check this SASS introduction, maybe you'll like it! Remember to never give up and keep trying!
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