Current Fast Drillings: These three buttons allow you to create a spot faced hole, tapped hole or smooth bore without opening the drilling templates.
Explore Templates: By clicking on this option, you access the list of drilling templates where you can select the one you want to use.
Add to Templates: This option allows you to save the current drilling operation (and its dimensions) in the templates.
Customize a Drilling: This option allows you to fully define a new type of current drilling (which is not in the templates). See here for more details.