This is my simple company homepage. When someone types www.mydomain.com, this page displays.
Although this experimental website is small and has just a few things in it, my real website has many web pages, files, folders, and applications, such as various versions of Moodle.

Link to Rick's MoodleCloud (example of linking to Moodle)
I might also link to other applications, like WordPress (example).
And I might want to link to individual files and folders.
mydomain.com/simple_word.docx
mydomain.com/simple_pdf.pdf
mydomain.com/course_support/
mydomain.com/course_support/simple_word.docx
mydomain.com/course_support/simple_pdf.pdf
public_html (i.e., webroot and document root, the same)
(note: document root allows index.html to show at root domain.)
├── index.html
├── simple_word.docx
├── simple_pdf.pdf
├── simple_html.html
├── (many other files, such as html, doc, jpg, etc.)
├── (many other folders, such as courses, professional, family, school, js, images, css, etc.)
├── moodle50
│ ├── index.php
│ ├── (other Moodle files)
│ ├── (many other Moodle folders)
├── wordpress
│ ├── index.html
├── course_support
│ ├── course.html
│ ├── simple_word.docx
│ ├── simple_pdf.pdf
├── images
│ ├── master_course.jpg
├── css
simple.zip (a zip file containing items in this website)