Important note about FTP
The next video comes in two versions:
Cyberduck (Compatible with Mac, Windows)
FileZilla (Compatible with Mac, Windows, Linux)
You can find a detailed comparison here: https://www.slant.co/versus/1711/5954/~cyberduck_vs_filezilla
These are tools which will help you upload your files to a server and share your websites with the world.
You can choose the one you prefer.
I suggest watching both videos, then deciding which tool you are the most comfortable with. (PS: I prefer Cyberduck for its simplicity)
Duck (Compatible with Mac, Windows, Linux)