From a related word or phrase: This is a redirect from a word or phrase (term) to a page title that is related in some way. This redirect might be a good search term, or it could be a candidate for a Wiktionary link.
Redirects from related words are not properly redirects from alternative spellings of the same word. They are also different from redirects that are subtopics or related topics, because unlike those, a related word or phrase probably does not warrant its own subtopic section in the target page or possess the possibility of ever becoming an article, template, project page, and so forth.
From a subtopic: This is a redirect from a subtopic of the target article or section.
An {{anchor|anchor name}} or {{visible anchor}} template, an HTML element with id="anchor name", or an |id=anchor name parameter can be placed at the beginning of a paragraph, substituted into a section header, or inserted within a table. Anchors may also be old section headers that have since been renamed, in order to preserve existing internal and external links.
Although section headers of the form ==(Header name)== act as anchors by default, with them use {{R to section}}instead.
When appropriate, protection levels are automatically sensed, described and categorized.