It is best to make a virtual environment for every new project, since some libaries, if installed togther can create conflict. Installing them on system python is NOT a good move.
python3 -m venv <path-of-installation>
<path-of-installation>\env\Scripts\activate
source <path-of-installation>/env/bin/activate
It’s package manager for python.
pip install -r requirements.txt
< Extract the .zip and Cd into the folder, install requirenments >
python setup.py install
Everything about pip is here