English line breaking rules

Question

In Czech typography, some prepositions are not allowed to be at the end of the line, so line break is not allowed between that preposition and the following word.

Are there similar rules in English typography? Are there any situations where a line break is not allowed or discouraged?

Note: I'm not worried about hyphenation, I expect that my typesetting program (LaTeX) will handle that for me.

Answer 1

In English you can have a line break at any point in a sentence, it is not restricted by nouns, verbs, prepositions, etc. The only restrictions I have come across are the ones pointed out by @Gnawme, the "widows" and "orphans", but those rules are aesthetic and not grammatical.

Answer 2

A concern for typographers in almost any language (typography is a visual art, after all) is avoiding widows and orphans. As this site explains:

A widow is a short line or single word at the end of a paragraph. An orphan is a word or short line at the beginning or end of a column that is separated from the rest of the paragraph. Widows and Orphans create awkward rags, interrupt the reader’s eye and affect readability. They can be avoided by adjusting the type size, leading, measure, wordspacing, letterspacing or by entering manual line breaks.

Not paying attention to this detail might make for awkward, if not erroneous, reading -- imagine if you left a key word in a paragraph a widow, and the page break was such that the widow ended up on a separate page -- but it wouldn't cause grammatical errors in English.