'Error installing packages using conda command

I have Python 3.10 and I installed Anaconda 3 today. I would like to install packages by Anaconda prompt, and I do the following for example:

conda install fiona

However, the following error appears:

conda is not recognized as an internal command

How to adjust this?

If I do pip install fiona, then it works.

What could be this error of not working the command conda. My system is Windows.

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Solution 1:[1]

You have to add conda to your environment path. Otherwise your terminal/commmand prompt won't recognize the conda command straight away. You can check how to set environment variables and save them in your operating system here.

Solution 2:[2]

You need to add Anaconda to PATH. In my case, anaconda installed into C:\Anaconda3. I added C:\Anaconda3 and C:\Anaconda3\Scripts\ to my path variable. Set PATH=%PATH%;C:\Anaconda3;C:\Anaconda3\Scripts\

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Aravind G.
Solution 2