HTML stands for Hypertext Markup Language. We use HTML to write the structure of the website. Making a website is kind of like making a cake! 🎂 HTML is basically a recipe and the 'elements' are like the ingredients.
CSS stands for Cascading Style Sheets. We use it to describe how the HTML should be displayed. If HTML is the cake, then CSS is all the icing and decorations that make it look nice!
JavaScript adds functionality to your website and allows people to interact with it. So if we've baked and decorated our cake, JavaScript basically tells people how to eat it!
If you want more in-depth information, check this out
Now that you know a bit about bakin' cakes (and writing web development code), it's time to run Hello World! Head here: https://www.tutorialspoint.com/online_html_editor.php and click the '⚙️Preview' button in the top left hand corner. You should be able to preview your "Hello World" website in the pane to the right. This example has HTML and CSS.
Now that you know what some simple website code looks like, here's some more information about what all that code is and what it does: