Your questions were fine, some of the answers were a bit bogus.
FWIW I recommend learning how to build a .deb package. These days people
are hyped for containers and virtualization, but package maintenance is
still a useful tool in every user's shed. To paraphrase Mr. Heinlein's
answer:
https://linuxize.com/post/how-to-install-python-3-7-on-debian-9/
is a great link to start with. Read through it, ask questions. Learn to
configure, make, make install. If you don't understand the steps listed
in that article there are easily a couple dozen PLUG members who can
easily explain what each and every one of those commands is doing.
Docker is a lesson all on its own. Set that topic aside for another day.
-Ben
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