Basic HTML and HTML5

<h1>

<p>

<!-- and end with a -->

<main>

<img>

<img alt="">

<img src="">

When <img alt=""> is ok?

<a>

<a href="">

<a href="#id">

<a target="">

<a target="_blank">

<a target="_self">

<a href="#">

<a href="link"><img src="https://bit.ly/fcc-running-cats" alt="Three kittens running towards the camera."></a>

<li>

<ol>

<ul>

<menu>

<input>

<input type="text">

<input type="text" placeholder="">

<form>

<form action="URL">

<button type="submit">

<input type="text" required>

<input type="radio">

<input type="radio" name="">

<input type="radio" value="">

<input type="radio" name="a" checked>

<div>

<head>

<body>

<figcaption>

<figure>