Headings will have a different range of sizes based on the browser it is viewed on. Headlines are titled H1 through H6, with H1 being the largest and H6 being the smallest size headline. How you may control the text size and color will be done using CSS.
When you what to make a word or character bold or italic you should inclose it in a tag using with either a "i" or "b" enclosed in sideways triangle brackets. This is used to highlight certain features of the text. This is caused by a change in uniform to the paragraph.
To create breaks or spaces in between lines or paragraph's one should use the line break or "br" tag.If you wish to create hoizontal breaks between sections you may use the "hr" or horizontal rule tag. Empty elements often only use one tag.