i need some help, creating my first portfolio :)

I would really appreciate it if you could take a few minutes and give me a short feedback what mistakes i made haha

I am trying to get into web dev and followed a portfolio tutorial by https://www.youtube.com/user/TechGuyWeb, but i cant figure out why the footer is not working on the "my work" page. I also bet you will be able to find a few other things i could improve.