Responsive Sign-Up using CSS Flexbox and JavaScript

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

I'm extremely proud of how far I've come in my journey ever since I started taking on these challenges. I've been able to massively improve on how I structure my code, how I think about implementing my JavaScript code and I know there is still a lot of room for improvement. Thanks to the wonderful people in this awesome community who continue to give feedbacks and what could be improved on.

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

The JavaScript side was a bit tough to work on, I intended on making the password require stronger characters but I wasn't sure how. I'm not sure I entirely got the error messages and error icons to work as intended. I'd really appreciate any feedback as to what I could have done better or improved. Thank you very much!

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

How could I have implemented a password validation in my code to check the number of characters, the types of characters and also require Upper/lowercase characters?

I tried to do it and kept hitting a wall.