One of the nice features of the Org Mode agenda is that it lists the file the agenda item came from at the left of each item. That makes it easy to see what the item is about. For instance, if I see “b-ideas,” I know that this entry is an idea for a blog post.
Sacha Chua passes on a tip from D.C. Toedt from which I learned something new. It turns out that having the file name appear at the left of the agenda item is merely the default. By using the CATEGORY property in the top-level headline you can change what appears in the agenda. As Chua notes, this is great if you like to keep everything in a single file.
Having the name of your single Org file appear in each agenda item is not very helpful but by using Toedt’s tip you can easily arrange for useful information to be put there. When you read Chua’s post, be sure to follow the link to her configuration to see how she breaks out the various categories of her agenda items.