Most server providers prefer that you upload copy your Web files from your PC to the Web serverusing an Internet tool named FTP.
If you're familiar with FTP, you can always do it that way. But the publishing facilities built in to Composer can be much easier to use. More important, when you make changes to your pages online.
Even if you do know FTP, I recommend giving the Composer publishing tools a shot anyway. (If you don't already know FTP, you have no need to learn nowat least for publishing purposes.)