In WordPress everything has an “ID”. Pages, tags, categories, menus…etc all have “ID’s” which is how they are referenced and saved in the database. To locate the ID of any post or Page in WordPress is very simple. There are actually different ways and even plugins that can be used but I find the easiest method is to simply go to the edit screen and look at the URL, where you will see the ID in the format “post=ID”.
In this case the ID for this specific template would be 1155.
Locating a Term (Category) ID
Locating the term ID is basically the same as locating a post ID. You would go to the term/category edit screen and look at the URL however instead of post=”ID” you are looking for tag_ID=”ID”: