So you want to find where all your log files for Apache are located? Well, you can search for it using a search engine (I'm sure it is a common question). Another way to do it is using the find command using CLI.
To do it, you'll just run this command and change the directory and extension to suit your needs.
find $directoryToSearch -type f -name "*.extension"
This command will return the files as well as their location.