Controlling line breaks Wikipedia:Manual of Style

mos:nbsp

it desirable force text segment appear entirely on single line‍—‌that is, prevent line break (line wrap) occurring anywhere within it.

a non-breaking space (or hard space) never used line-break point. markup: 19 kg, code 19 kg or 19{{nbsp}}kg.
or use {{nowrap}}, {{nobreak}}, or {{nobr}} (all equivalent). markup: 5° 24′ n code {{nobr|5° 24′ n}}

it desirable prevent line breaks breaking across lines might confusing or awkward. example:

whether non-breaking space appropriate depends on context: whereas appropriate use 12{{nbsp}}mb in prose, may counterproductive in table (where horizontal space precious) , unnecessary in short parameter value in infobox (where break never occur anyway).

a line break may occur @ thin space ( , or {{thinsp}}), used correct too-close placement of adjacent characters. prevent this, consider using {{nobr}}.

insert non-breaking , thin spaces symbolically ({{nbsp}}, {{thinsp}},   or  ), never entering them directly edit window keyboard – visually indistinguishable regular spaces, , later editors unable see are. inside wikilinks, construction such [[world war ii]] works expected, [[world war{{nbsp}}ii]] not work.

adjacent quotation marks: templates {{ }} , {{ }} add sliver of visual space between adjacent quotation marks/apostrophes better readability. markup: announced, answer yes!{{ }} or {{ }}yes! answer.

cite error: there <ref group=lower-alpha> tags or {{efn}} templates on page, references not show without {{reflist|group=lower-alpha}} template or {{notelist}} template (see page).