Why can't I find ALL_TAGS in the Crave theme?

I want to insert some custom code in the Crave theme to filter out specific collection tags. All my research says that I should be able to modify the .liquid where the tags are being read. However, I cannot find this code or anything similar when I look through my various .liquid files for my theme. Does anyone know where tags are read within the Crave theme?

collection.all_tags

@owenandgraham - tags are usually added on products, but if you have added on collection then you can write this code into your collection theme file and get the tags

{{ collection.tags }}