Excluding a category from the WordPress Loop
Sometimes you might want to exclude a blog category from your WordPress loop, for instance you might have a category that you are using for something other than for blog posts.
The following piece of code goes right before your loop and you just need to find the category number you want to exclude and then change the number. I have included the first line of the loop so you can see where this code belongs.
If you are struggling to find the id number for the category, you just need to go to Posts / Categories and then hover over the category name that you want to exclude. Depending on your browser your should see the ID number right at the bottom of the page when hovering on the category name.
Hope you find this useful.