"HTML" It's New To Me!

HTML means Hypertext mark-up language is new to me. We used the notepad in creating these activities. I learned how to make HTML file. Also about kinds of tags and their descriptions.
When I save my activity, I forgot to type the extension name. It's a big mistake. My file name is different from the file name of my classmates.
I asked one of my classmates how to change my file name. I just edit the file name and add the extension name.
Moving on, I will know more about HTML. I will have more knowledge about HTML.