Exercise 1: Creating, Naming and Switching Windows — Possible Solution
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Steps:

  screen -S work            # window 0 is created automatically
  Ctrl-a A   edit           # name window 0 "edit"
  Ctrl-a c                  # new window 1
  Ctrl-a A   logs           # name it "logs"
  Ctrl-a c                  # new window 2
  Ctrl-a A   shell          # name it "shell"

Switching:

  Ctrl-a n / Ctrl-a p       # cycle next / previous
  Ctrl-a 0                  # jump to "edit"
  Ctrl-a "                  # list: 0 edit, 1 logs, 2 shell — pick one
  Ctrl-a '  logs            # jump by name

Close "logs": switch to it and type exit (or Ctrl-a k). The windows are
now 0 edit and 2 shell.

Open a new window with Ctrl-a c. It becomes window 1.

Why: screen gives a new window the lowest free number. Number 1 was
freed when "logs" closed, so it is reused, filling the gap rather than
becoming window 3.

WHY THIS WORKS AS AN ANSWER
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It exercises every way of switching and shows why names are more
reliable than numbers: numbers get reused, so "window 1" can mean a
different window from one moment to the next.