This is where all of the tags are.

Tags allow data packs to group things together to recall them later. For example, there is an item tag called "herbs" that contains a collection of specific flowers. Multiple recipes can recall this "herbs" item tag once or twice instead of needing to specify the exact flowers every single time.

There are multiple types of "tags", like a tag list for Blocks, but Reg's More Foods only uses item and mob effect tag lists.