Principle and usage of vim help tag

problem description

vim in an environment where ctags is not installed, why you can still use jump in the help file to jump to the appropriate tag.

how do we use the tag function of vim without ctags

Vim
Mar.28,2021
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-64f5-1b30a6d-2bd14.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30a6d-2bd14.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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