Design Script isn’t IronPython. Iron Python is an integration of Python, so what you learn in any python course should work. These are used in Dynamo via the Python nodes. This topic has some good Python education sources:
If you’re looking for Design Script, I’ve already referred about 300 people (not a joke) people to the recently released Design Script presentation by @solamour. It’s the most robust tutorial I’ve seen and doesn’t rely on videos (personally I don’t find people learn as well by watching videos).
