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Be sure you have a basic understanding of HTML tags. Learn some of the basic CSS properties. Learn about values for each respective property. Learn about the style HTML attribute. Understand that inline CSS is not usually used for websites by professional web developers.
You should know how tags work and of the src and href attributes. You will find that there are very many properties. However, it is not necessary to learn them all. Some good basic CSS properties to know are color and font-family. All properties need a value. For the color property, for example, you might put the red value. It is used within an element like href or src. To use it, within the quotation marks after the equal sign, put the CSS attribute, a colon, and then the value of the property. This is known as a CSS rule. Inline CSS can add unnecessary clutter to an HTML document. However, it is a great way to get introduced to how CSS works.