Tags will get you alot of project views if you have alot of tags.
When you search somethign in scratch, the projects with the tags of what you were searching comes us.
So if you have a tag that says "pokemon" and somebody types "pokemon" then they will have the option to click on your project so they probably will
That is what tags are for. If you wanted to get a lot of views then you could get loads of tags and popular tags but i DO NOT recommend this
The more detailed your tags are the easier your projects will be to find...so if you want to help people find your project, add some tags!
Here is a page listing popular tags for this site:
If you want your project to be one that comes up when others perform a search, it is a good idea to add as many tags that relate to your project as possible.