How to clean log files in Linux

Fisrt, See the logs that are in the logs area of /var

du -h /var/log/

The du command prints the estimated disk space usage of each file and directory for the path that you specified.
The -h argument causes the command to print the information in a human-readable format.

https://linuxhandbook.com/empty-file-linux/

https://support.hostway.com/hc/en-us/articles/360001972270-How-to-clean-log-files-in-Linux