Responsive Social Link Profile

What are you most proud of, and what would you do differently next time?

I make is responsive, checked in my phone and worked as i wanted it to be

What challenges did you encounter, and how did you overcome them?

Trying it to make it responsive

What specific areas of your project would you like help with?

I really would like some advice on "semantic tags" i did some research but not much. and 2 people already gives me feedback to use semantic tags rather using "div". i do not understand, could i actually replace the div using another tag? like the tag actually have the same function like div? what are the normal website using semantic tags looking like, etc