The tutorials for Oracle Dev Gym classes run on Live SQL.
To run them, ensure you are logged into Live SQL. Use the "Login to Run Tutorial" button on the top right:

Some tutorials have setup code you need to run. To this click the "Execute Prerequisite SQL" button at the top of the right panel:

Once you've done this, work through the sections, loading the code with the "Insert into Editor" button and executing it with the "Run" button:

Run through the tutorials in the same order they're in the class modules, following the steps in each tutorial in order. If you get stuck/lost at any point, you can reset everything using the "Reset Session" under the Actions button on the top right. Then run through all the steps again up to the point you reached - many of the tutorials require you to complete the earlier steps for the later code to work.
If you have further questions about Dev Gym classes, please use the Feedback option on the top-right menu of Dev Gym.