Monitoring your PHP error log is a great way of tracking any errors or debug information when working on your site.
Showing the log file in the VS Code terminal window is a great way of keeping an eye on any log entries as they appear.
The tail command can be used to show the latest log entries.
In the example below I am showing the php_error.log file from MAMP, showing the last 100 entries, and any future entries (-f).
tail -f -n100 /Applications/MAMP/logs/php_error.log