Anaconda3 and base environments upon installation of anaconda
After freshly installing anaconda on my (windows 10) system, I see a base and an Anaconda3 environments.
I cannot figure out what this Anaconda3 environment is and why it is installed automatically. Should I remove it?
It is just a conda environment. You can access it and see what is included with activate Anaconda3 in the console. You can see what version of python it is by then typing "python" into your console and checkout which packages are installed with pip freeze.
Note, that depending on how you reinstalled your anaconda, your old environments can persist. Thus, this could be an environment you previously created as part of a tutorial or something. As long as you are not seeing anything in the above that might mess up your work (such as it having your expected packages / python version) it is safe to delete.