Mobile-first solution using basic HTML & CSS

Hey everyone!

All feedbacks are welcome.

I would love to get some feedback about:

• The HTML of my code. Is it fully semantics? Does that h3 tags that I setted inside de li items make sense?

• I definetely still need to understand flexbox better. I would like a lot about feedbacks on that.

• I struggled a litle to set de image the way I wanted. That flex-basis property wont let me sleep tonight.

• Is my use of margin and padding correct? Any recommendation?

• What about that cover image colour? Is that ok?

Thank you a lot! Wish you all a great day!