So far I've always started with Anaconda3 in the Jupyter Notebook and done exercises. I now have to go into interactive mode for a few practice examples, but I'm not exactly sure where and how to start it. Via the terminal? In general, I don't understand where I can find the IDLE, it's just standing there on the hose. 😅
When I start Anaconda3, I have Jupyterlab, Jupyter Notebook etc in front of me.
You can start the interactive mode via the Anaconda prompt. You can find illustrated instructions https://docs.anaconda.com/anaconda/user-guide/getting-started/#open-anaconda-prompt.
Where to find the IDLE, https://docs.anaconda.com/anaconda/user-guide/tasks/integration/idle/.
https://gcourtade.github.io/all/2019/03/26/using-idle-with-anaconda.html is also described how you can set up the IDLE (on a Windows OS) as the standard editor for Python.