I know that
/etc/passwd are modified, and
/home/user/* is created, but are there others?
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It depends on what NSS system you're using. If it's a standard unix login, typically /etc/passwd and /etc/shadow only. /etc/group is only used if creating a new group or adding the user to supplementary groups.
The files from /etc/skel are typically copied into the new user's home directory, which need not be /home/user
Things such as mailboxes and crontabs are generally created in an on-demand basis, so not when the user is created (the mailbox is normally created when the user receives their first item of email)