No special softwares are needed for creating HTML files, you can use any text editor, but we recommend to use Notepad++ in windows.
First open the editor, select File -> New.
Now type the following html program.
After typing the above program just press ctrl + s (windows) or ÿ + s (Mac), now a Save As dialog box appears and asks the file name, you just enter your file name with the extension(.html). Here we have saved the file as new.html
To execute the saved new.html file just double click on the file, a web page will open in the systems default browser.