Welcome to the Developer Community Patrick!  

The good news is that there is a ton of resources available to you, the bad news is that there is plenty to learn! IRIS has so many features and use cases that it is difficult for newcomers to find the best entry point for them. It also depends on what you are working on with IRIS and your own technical background. 

The first port of call is probably learning.intersystems.com, you can find plenty of courses here. I recommend filtering to see Learning Paths, then working on the paths which sound most suitable for your use case. My favourite when I was starting was Building a Server-Side Application with InterSystems. There are also many quickstart resources here if you want short beginner focussed documentation on different topics. 

I would also recommend getting set-up using an IRIS Community docker container, to have a personal IRIS instance so you can start working on your own practice projects locally. If you get used to using docker-compose projects with IRIS, there are over 1000 example applications on Open Exchange that you can look at, test, or even fork for your own projects.  

Finally, for more links and resources, this is a really good write up from @Kate Lau with resources she found useful starting out. 

If you have any specific topics you are looking for content on, feel free to ask more about these. Best of luck getting going!   

Awesome work Geet!