User research is also called as design research, when I asked my friend (no experience in this industry) "what is user experience researcher? ", "I think that it’s the best job(it paid well) that I can imagine, they just talk to some people and ask them questions to get the answers. How hard it could be" he said. Yeah, he may get some point, but ux researcher is definitely not an easy job, like never.
The value of user research
What are the responsibilities of being an user experience researcher?
The methods of UX research
What makes a good user experience researcher
I meant to post more details for you to learn about User Research, due to the long body of it, I just list the important points to learn user research. If you want to read more, please read the how to become an excellent user experience researcher. Hope it's helpful for you！