[Python] PIP installation for Python3 problem: Consider adding this directory to PATH

I tried to install pip in python $ python get-pip.py through terminal but had this warning in Terminal.

Python3.8
MacOS Catalina

Please help . I have been trying to search for answers for days

WARNING: The scripts pip, pip3 and pip3.8 are installed in '/Library/Frameworks/Python.framework/Versions/3.8/bin' which is not on PATH.
Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

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