New env: PackagesNotFoundError

Been using Jupyter Notebook successfully for a few months to learn Python, Numpy, Pandas, Matplotlib for an online class—but always in the (base) env.
Now I’ve gone back to work through the “Get Started With Anaconda” tutorial videos, which recommend never to work in (base) but instead to set up a new env for every project. But as soon as I, in Conda Prompt, activated my new env, basic installations that the videos expect, such as Jupyter, Python, and ipkernel, are missing. On trying to install them manually, every attempt produces the following error message:
“PackagesNotFoundError: The following packages are not available from current channels:”
What gives? I’m new to envs, no IT whiz, I haven’t fiddled with any default settings, and I’m only wanting to install software packages that I’ve actually used in (base). What better way to discourage a newbie from using environments?

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