How to retrieve position, rotation and interaction data from a user

Hi,

I'm quite new to development on Unity for VR apps. I'm currently working on simple apps to get a feel for how it all works. I'm trying to develop a few apps that require access to the user's position, rotation, and more. My big problem is that I'm not sure where I can get all this information from. Hence, i was wondering if there's an SDK or API that can help me extract this data from a user.

Also, if there's an easy way to set up flags/triggers (such as checking whether a user picked up a cube or not) that would also help.

If you have an answer to these questions or any other resources which you think may be of help as well, I'd really appreciate it!

Thank you.