How to create a simple tag system
I am working on developing a new contacts database, and want to create some kind of simple tag system that can allow for quick data entry, be highly visual, and allow for quick finding and sorting. Attached is a photo from an online system that is a bit similar to what I am thinking. In the past I have created 'category' fields and used drop down menus and/or radio boxes. They work for a few variables, but this one could potentially have 20-40 different tags. How can I create this kind of function? I've designed a few databases, but am somewhat of a neophite here, so forgive my ignorance if there is a simple solution.