Step 1: Create a Conda environment.
conda create --name firstEnv
Step 2: Activate the environment and install any package you need in this environment.
For example, I am going to install Tensorflow in this environment. The command to do so,
conda install -c conda-forge tensorflow
Step 3: Now you have successfully installed Tensorflow. Congratulations!!
Now comes the step to set this conda environment on your Jupyter notebook, to do so please install ipykernel.
conda install -c anaconda ipykernel
After installing this, just type,
python -m ipykernel install --user --name=firstEnv
Using the above command, I will now have this conda environment in my Jupyter notebook.
Step 4: Just check your Jupyter Notebook, to see the environment firstEnv.