Exercise 3: A Reattach-or-Create Shortcut — Possible Solution
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Add to ~/.bashrc:

  alias work='screen -d -R -S work'

Then reload it:

  source ~/.bashrc

How it behaves:

  - No "work" session exists       -> -R creates a new one named work
  - "work" exists and is detached  -> it is reattached
  - "work" is attached elsewhere   -> -d detaches it from there first,
                                      then it is reattached here

Why these options:

  -S work  gives the session a fixed name, so the command always finds
           the same session rather than an arbitrary one.
  -R       reattaches if possible, creating the session otherwise.
  -d       handles the common case where an old connection (for
           example a laptop that went to sleep) still counts as
           attached.

Using -D instead of -d would also log out the other terminal. That is
stronger, and can be useful if you want to be sure the old login is
closed, but -d is enough for most people.

WHY THIS WORKS AS AN ANSWER
------------------------------
It covers all three starting states (missing, detached, attached
elsewhere) and justifies each option, rather than just copying a
command.