Understand The Folder of Apache Triad

There are a few important folders you need to know. To better understand each function, you can see the explanation as follows:
bin        : Main folder of Apache2 Webserver
conf     : contain files to configure Apache2 Webserver
ftp         : contain tools FTP(File Transfer Protocol) for data transfer
htdocs : main folder for saving the data of user script of PHP or HTML. In this folder, you can make your own subfolder to manage your script.
manual : contains subfolders in which there is manual and database programs, including PHP and MySQL. 
mysql   : The main folder for the MySQL database server. In it there are subfolders data for recording all the names of database, and bin subfolder that contains the MySQL client and server tools.
pgsql    : main folder for database PostgreSQL server
Perl       : main folder for perl programming
php       : main folder for php programming
python : main folder for python programming