Link - http://codepen.io/codejsp/pen/jyaYwZ
Do I need to use stuff like <header> <section> <aside> <footer> or can I just use divs?
And do I need a <main> and if I do, where do I put it?
Hey @codejsp,
this are semantic elements. But they are not just to structure your app, they are also part of the Web Accessibility.
For example when a blind person is visiting your page he will use a screen reader and this screen reader is using your semantic tags.
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ahhhhh… good to know. Thanks 
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You don’t need them, but they were added in order to provide semantics to your page. <div> should be used for stylistic purposes and as a generic container, as it doesn’t mean much by itself. You can definitely just use <div>s, but your page won’t have any semantics. I suggest you read about those tags and where to use them. I’m trying to get in the habit of using appropriate tags for each purpose myself.
Here’s a good course on (semantic) HTML and CSS: http://learn.shayhowe.com/.
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You’re welcome, glad I could be of help.