The most commonly used Tailwind CSS classes are:

* **flex** and **flex-box** classes are used to lay out elements in a flexible way.
* **width** and **height** classes are used to set the size of elements.
* **margin** and **padding** classes are used to add space around elements.
* **text-align** and **text-color** classes are used to align and color text.
* **border** and **border-radius** classes are used to add borders and rounded corners to elements.
* **background** and **background-color** classes are used to set the background color and image of elements.
* **display** and **visibility** classes are used to control the visibility of elements.
* **position** and **float** classes are used to position elements on the page.

In addition to these general utility classes, Tailwind CSS also provides a number of more specific classes for things like forms, buttons, tables, and typography.

Here are some examples of how to use the most commonly used Tailwind CSS classes:

```html
<!-- Flexbox layout -->
<div class="flex flex-col">
  <div class="flex-grow">This is a column</div>
  <div class="flex-grow">This is another column</div>
</div>

<!-- Width and height -->
<div class="w-1/2 h-100"></div>

<!-- Margin and padding -->
<div class="m-10 p-5"></div>

<!-- Text alignment and color -->
<h1 class="text-center text-blue-500">This is a heading</h1>

<!-- Border and border radius -->
<div class="border border-gray-300 rounded-md"></div>

<!-- Background color and image -->
<div class="bg-gray-200 bg-image:url('/image.jpg')"></div>

<!-- Display and visibility -->
<div class="hidden sm:block"></div>

<!-- Position and float -->
<div class="fixed top-0 left-0"></div>
```

You can learn more about Tailwind CSS classes and how to use them in the official documentation: https://v2.tailwindcss.com/docs.
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