1/4- Ordinary `pip install` works for binary/platform-specific wheels (e.g., numpy) too and even non-Python utilities (e.g., shellcheck-py) 2/3- you need to tr

1/4- Ordinary `pip install` works for binary/platform-specific wheels (e.g., numpy) too and even non-Python utilities (e.g., shellcheck-py) 2/3- you need to track only the direct dependencies _manually_ but for reprodicible deployments you need fixed versions for all dependencies. The latter is easy to generate _automatically_ (`pip freeze`, pip-tools, pipenv/poetry/etc).