Maybe you are a web designer, or you have an index file and want to upload it to your site. You can follow this tutorial to upload your web site files on your hosting account.
Open FileZilla FTP Client.
Enter your FTP Host, Username, and Password. You can use your cPanel username and password as your FTP User and Password and then click on the Quick Connect
In the Host
field, You can use your domain name like ftp.example.com
Make sure that you are inside the public_html
folder, If not then double click on it to go to the public_html
Under Local Site
in FileZilla, Open your folder where your index file, etc., is located and then select your index file and click on the Upload
The index file will be successfully uploaded.