There is some useful stuff to learn from here, undeniably, but many of these are a bit useless when you compare them with what you would actually typically need

There is some useful stuff to learn from here, undeniably, but many of these are a bit useless when you compare them with what you would actually typically need on a real site. Yes, the "image slider" is vaguely functional, but really most of the time you will want a lot more control than just the CSS animations allow; similarly, yes, the form validation is a starting point, but normally you would want to customise the error messages and generally fiddle around with it a lot more; I'm not really sure the modal is fit for purpose beyond the most basic use case... etc. It's fun to see what you can partially achieve without JavaScript, but there is no shame in using JavaScript sensibly to enhance the usefulness of a web site.