For increased discoverability all guides must have:
To select Subjects for your guide select the guide in LibApps and then click on the edit symbol (the little pencil) next to the Subjects
Once you click on this you will be taken to a pop up that allows you to select which Subjects apply to your guide. You are not creating the Subjects, they will already be listed for you.
Note: Subjects were created by a small committee and were selected to represent the offerings of databases and guides available at the time. If you are not seeing a Subject listed that you think should be added please reach out to Kelleen Maluski, guides are meant to be dynamic and suggestions like this are valued.
To create Tags for your guide select the guide in LibApps and then click on the edit symbol (the little pencil) next to the Tags
You are creating the Tags. As you type you may be offered suggestions of ones that already exist, using this can be a good way to increase cohesion and discoverability, but you can create your own as well.