With the advent of computer word processing, we have all become typographers. Unfortunately, most of us were trained in typing class. We learned the rules for typewriting and not the rules for typesetting. The following are some important distinctions between the two and general rules for good typography.
Good typography is readable.
Sentence spacing In typing class, most of us learned to put two spaces between sentences. We are not using typewriters, now. Use only one space between sentences, and one space after colons and other punctuation. It provides uniform or normal letter and word spacing, minimizes awkward hyphenation of words, and provides the eye with a common starting point for each line. Any significant amount of text set centered or ragged left is very difficult to read because the eye must search for the start of each new line.