HTML is a language used to create web pages and web applications.
There are plenty of resources online to help you learn HTML such as W3Schools or HTML.net.
Once you you have put something on your webpage you can use CSS to make it look better. You can use W3Schools to learn CSS aswell as HTML.
When you are happy with what your webpage looks like you can upload it to a server using FTP-File Transfer Protocol. CoreFTP is a free program you can use to upload files to a server.