What is h2 and h1? I didn't see them in the css page?

Hmmm, I don't really know the context in which you're referring to H1 and H2, but essentially they mean Header 1 and Header 2 and when you put the tag you're stating that you want a header with a specific size 1-6 Ex: <h4></h4> means Header of size 4

The <h1> to <h6> tags are used to define HTML headings. <h1> defines the most important heading. <h6> defines the least important heading.

H tags are headings, with <h1> is being the largest heading and <h6> being the smallest.

You can target them in the CSS by either adding a class: i.e. <h1 class="myClass">Heading</h1>. Alternatively you can use the following in your stylesheet file: h1 { color: red; }, which will target all h1 tags.

Yes,

h1 { color: red; } this is how you are styling or adding effects to a simple text which we wrote in HTML like this <h1 class="myClass">Heading</h1>.

There are two ways here that you can refer to this <h1 class="myClass">Heading</h1> tag in CSS and behaves differently:

1. By Tag Name: h1 { color: red; } - This one applies to all the h1 tags in your HTML document i.e., For all the h1 tags in your HTML change the text to color red.
2. By Class name: myClass { color: red; } - his one applies to all the tags in your HTML document that hold myClass as their class name i.e., For all the tags in your HTML where the class name is myClass, now change the text to color red.