Some of the most common markups are a the h1-h6 for headings, P for paragraphs, BR for breaks, B for bold, and I for italics. These are added into the code to change its appearance and how the text is structured. When typing in the code any space between words that doesn’t have a markup will not show on the page, this is called White Space.
Sematic markups don’t change the structure of the text but add more info. Some of these are things like underline, crossed out, and emphasis. Adding these markups can be used by programs such as voice readers to allow the person listening to know that something was emphasized.
You can change the color of all the elements of a webpage for the text itself to the box surrounding the text. There are three ways to specify color, these are RGB values, hex codes, and color names. When changing the colors on a page it is important to keep the contrast higher so that it is easier to read.