On reddit, one can simply type u/me or r/reddit - I can see mentions of /u/user or /c/community in descriptions but doesn’t seem to mention a sublemmy like a subreddit.
Also, can’t seem to share a Lemmy Profile with their URL like for mine as example.
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for users use @ and start typing the name, for communities use ! and start typing the name.
Also wrong community for lemmy support questions.
user:
@username@instancenameuserison.tld
community:
!communityname@instancenamecommunityison.tld
User mentioning syntax:
@<username>@<domain.tld>
Example: @Avieshek@lemmy.world (you should get a inbox notification)
Community mentioning syntax:
!<community>@<domain.tld>
Example: !asklemmy@lemmy.world