At least in all the introductory exercises, there is no reason to mention --decorate on git log as that is more or less the default behaviour anyway and doesn't add to the understanding.
Git help log:
--no-decorate, --decorate[=short|full|auto|no]
Print out the ref names of any commits that are shown. If short is
specified, the ref name prefixes refs/heads/, refs/tags/ and
refs/remotes/ will not be printed. If full is specified, the full ref
name (including prefix) will be printed. If auto is specified, then if
the output is going to a terminal, the ref names are shown as if short
were given, otherwise no ref names are shown. The option --decorate is
short-hand for --decorate=short. Default to configuration value of
log.decorate if configured, otherwise, auto.
At least in all the introductory exercises, there is no reason to mention
--decorate
on git log as that is more or less the default behaviour anyway and doesn't add to the understanding.Git help log: