To build web pages and eBooks, you'll need some kind of HTML editor. I use 1st Page 2000 for all my HTML editing. It is 100% Free for ever with all features working. This page and web site is being built with this editor.
After the editor is installed, you'll need some web pages to study. Search Google with the key words "free web page template". Don't worry, I just did it. Here is the search results.
Quick Lesson:
All I did to begin learning was to simply open up these templates and study the code from within the editor and try to relate it to what I could see on the actual web page. For example, here is a shot of code from within the HTML editor:

This is a screenshot of some code from this web page. Study the code and relate it to what you see on this page. The red and blue codes are commands which create a hyperlink and cause the link to open in a new browser window.
Take it easy. Learn one command at a time. It won't be long before you get some web pages happening.
When you are ready to learn some more commands, go to HTML Goodies for a good range of Free tutorials.