Can I import CSS and JavaScript files to Vuetify for importing some components? Or Can I put an entire theme that would be a basic HTML theme?
For example, I found a tool that is needed in the project can I integrate it with Vuetify such as Datatables, JS validation Plugins, or some statistical widgets, even an entire theme?
Vuetify is a UI CSS framework.
So it will grant you some CSS components.
You can add pretty much what you want to it. It will have the issue of needing an overwrite in specific places (CSS cascade/specificity mainly).
But otherwise, nothing special will block you from using it alongside other things.