This post provides a collection of useful information I came across and links to the sources of my own ARCore demos.
Google provides a few options for ARCore development depending on what your favorite development environment is: JAVA, Unreal, Web or Unity3D.
There's even a Xamarin port of the JAVA sample available made by my fellow MVP Morten.
The Getting Started with Unity is a great How To I successfully followed.
The source code for my Unity3D ARCore experiments is published on GitHub: ARCoreExperiments.
I own a Samsung Galaxy S8 which is fortunately one of the supported Android devices. If you don't own one of those devices you might still be lucky using this hack.
Google also hosts a nice collection of AR Experiments some of them even include source code.
One of them is Portal Painter by Jane Friedhoff. She also wrote a great blog post how it was built.
Have fun and build some cool stuff!
Below a few more GIFs from my experiments. See all in full length at my YouTube channel.