After git reset is returned to a certain version, the git repository root workspace becomes that version, and the staging area is empty?

how can git reset only return the version of the git repository to a certain version without affecting the workspace and the staging area?
with such a rollback, all the new things in the workspace are gone

Mar.09,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3885c-2b66a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3885c-2b66a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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