They say "what you see is what you get",
I have seen this quote crushing in real testing world.
I've tested UI website that you can create group with some rules, so I've entered some inputs and hit the save button, after that I got nice popup telling me that the operation finished successfully.
If you, as a tester finished the test when seeing "the operation finished successfully" your missing the buty of testing world!
What you should do is go to :
1. Addictedly go to Logs in back end side and seek for errors and exceptions
2. Go to database and validate inputs from UI got to their place as expected.
3. Validate that the new group actually doing what is should according to the rules you've saved
This 3 are super important for getting high quality products after your testing.
Have a great day.