HTML

Question

What does div do in html code. And why I can't change the font color even i use font color code?

Answer 1

div{
color:red;
}
not::
div{
font-color:red;
}

Answer 2

div tags are used to divide your HTML code into sections.

About your second question, it would be better if you provide a code so we can help you.

Answer 3

The <div> tag is a container unit that encapsulates other elements within the page and divides the HTML document into sections.

example:

<div>
<p>Lorem Ipsum</p>
</div>

As far as the color of your font, keep in mind that perhaps the specificity of your CSS is overriding the font color selector you're trying to use.

Example of specificity; the first div tag selector would be overridden by the div with the ID selector (#).

div {
color: blue;
}

#div { /* this selector will override */
color: yellow;
}

As mentioned by the comment above, use the shorthand property for the font color.

example:

#div {
color: red;
}