Can this app be used to create an active website

Answer 1

No, you need to host your website files in an online host.

Answer 2

How can i apply different colour to my work on html?

Answer 3

Uba Francis To change the color of your HTML elements, you need to use CSS. For example, something like:
body {
color: black;
background-color: white;
}
would make your text black and the background white.