This site contains resources for the ISYS 390 course. It also provides examples.
Visual Studio Code is a free code editor that you can use to create HTML files. You can download it from https://code.visualstudio.com/.
Watch this tutorial to learn how to install Visual Studio Code: Visual Studio Code Installation Tutorial
Once you have installed Visual Studio Code, you can start creating HTML files. See Basic HTML Template for an example.
For more help watch this tutorial: Visual Studio Code Tutorial