HTML, CSS, Responsive Design, Mobile First, etc

As my first project, I must say that I am very proud of my abilities, although I must admit that it was not perfect in its entirety. For example, one of my biggest failures was not putting the waves that went between sections because I was not able to put them. From then on, I didn't have any other problems. If there is something that the community saw that is of your displeasure, I will be more than willing to receive the necessary criticisms.