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Writing a Webpage is quite simple: you just write the text you want to see on your page, for example:
This is my Page
I like it
To this text you then add some "tags" that tell the webbrowser how to structure and display your Text.
<h1>This is my Page</h1>
<p>I like it</p>
As you can see, Tags are enclosed in "less than" and "greater than" signs <like> <this>. Most Tags come in pairs: <h1> and </h1> belong together, the first one is the start-tag, the second one, with the "slash" is the end-tag. The text between <h1> and </h1> will be displayed as a heading - bold, big, important.
The <p> Tag is for marking a paragraph - a block of text that belongs together.
Try it in your jsfiddle now!
Write some text (or copy some text from a wikipedia-page) and give it structure with <h1> and <p> tags.