Note 1: All the following are used in the so-called Text (=code) post or page editor (as well as in text widgets).
Note 2: In all the following cases, “span” is for characters, words or phrases inside a paragraph; for a complete paragraph, you write “p” instead of “span”; for sections comprising more than one paragraph, including complete posts, you write “div”.
Note 3: To apply more than one of the following (or any other elements of “style”) to the same text, you combine them in the same tag, e.g.:
Hex color codes can be found in this or other similar webpages. For basic colors you can write a plain word instead of a hex number, without the sharp sign – e.g. “color:red”.
Changing color of links
If you use the visual editor, you must write the link text first, highlight it, change its color via the Color button, then turn it into a link via the Link button.
You may need to correct line-spacing, in which case you add this before the closing quote (the number is just an example):
Changing the font size is best used for individual effects, not for altering the overall appearance of your blog because you think the type is too small; what a visitor sees depends on his/her screen resolution (which may not be the same as yours), and all browsers have a zoom-in function.
Where I’ve put SPECIFY, you write the name(s) of a specific font. In theory you can specify any font you like, but a visitor won’t see it if s/he doesn’t have it installed; so you’d better confine yourself to “browser-safe” fonts (see here). Also, font names may differ between Macs and Windows, so you’d better write the full stack of equivalents and substitutes, e.g. “font-family: Lucida Sans Unicode, Lucida Grande, sans-serif;”.