HTML and CSS Blog responsive

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

The main tag, I did not know the existence of this tag and some help to use and a loved, and the media queries for the responsive design, I just really need to know a better way to do the responsive. the way a used is ok or there is another way to do it.

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

I still battle with the position of the elements, I still have a long road to go with that

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

Resources to learn responsive design (If there some in Spanish, I appreciate it) to help me to understand the tools i can use to create a responsive design