I downloaded FileZilla from the website, and the file type is tar.bz2. I extracted it which is a folder contains bin, lib and share sub folders. Since there is no instruction of how to compile them and I am not so familiar with compiling, so I ask for help.
PS: I know I could use sudo apt install filezilla, but I would rather get to know how to compile so I can learn something.
Thanks
The compiling instructions are documented on the FileZilla Wiki,
Then to actually compile it,
This is pretty much the standard way of compiling and installing most free/libre and open source software on GNU/Linux.