Infoboxes

Help:Infobox · Infobox templates · Infobox examples · Infobox colors

Long articles

Breaking up long articles
Article series boxes

Templates

Template:Convert (Adds autoconversions)

Merging and moving pages

How to rename (move) a page

Extended image syntax
Image modifier "magic" words
Image use policy
Tips for successful release requests

Layout

Wikipedia:Guide to layout

Lead section

Wikipedia:Guide to layout#Lead section

• Avoid links in the summary — users should be encouraged to read the summary, and the article, before jumping elsewhere. In addition, the colored highlighting of the links may mislead some users into thinking these are especially important points.

Headings

Wikipedia:Manual of Style (headings)

• Avoid special characters in headings, such as an ampersand (&), a plus sign (+), curly braces ({}), or square braces ([]). In place of the ampersand, use the word "and" unless the ampersand is part of a formal name.

• Avoid changing section headings — that will break section-specific links from within the article or from other articles.

• If you link to a section, leave an editor's note to remind others that the section title is linked. List the names of the linking articles, so when the title needs changing, others can fix the links more easily. For example: <!-- This section is linked from [[source#section]] --> .

• If you refer to a section without linking, italicize the section name.

• If you link to a section, do not italicize the section name, unless it otherwise requires italics (for example, if it is the title of a book).

Standard appendices

Wikipedia:Manual of Style (headings)#Standard appendices (See also, Notes and references, etc.)

Wikipedia:Guide_to_layout#Standard_appendices has more details.

Other resources

Tony1’s guide to better writing for FA Criteria 1a.

Abbreviations
Wikipedia:Manual of Style (abbreviations)

• The U.S. state abbreviations such as TX for Texas should not be used in normal text.

Capitalization
Wikipedia:Manual of Style (capital letters)
Wikipedia:Manual of Style (capital letters)#Acronyms and initialisms

• Do not emphasize the letters that make up an acronym.

Dashes and hyphens
Wikipedia:Manual of Style (dashes)

Dates and numbers
Wikipedia:Manual of Style (dates and numbers)
Wikipedia:Manual of Style (dates and numbers)#Dates of birth and death

• When only an approximate date is available, the abbreviation "c." (Latin: circa, "about") may be used.

Formatting of text and titles
Wikipedia:Manual of Style (text formatting) – Use of boldface and italics.
Wikipedia:Manual of Style (titles) (Titles of publications, etc.)

Pronunciation keys
Wikipedia:Manual of Style (pronunciation)

Words and phrases to avoid
Wikipedia:Words to avoid
Wikipedia:Avoid peacock terms
Wikipedia:Avoid weasel words

Wikipedia:Citing sources
Wikipedia:Citing sources/example style
Wikipedia:Citation templates
Template:Cite web
Help:Footnotes

• For each footnote: <ref>...</ref> within text.
• To set up footnote for more than one use: <ref name=[Name]>...</ref>, then <ref name=[Name]/> thereafter.
• To list footnotes: <references/>

However, if there are a large number of references listed, it is preferable to use <div class=references-small><references/></div>

If an article needs references but you are unable to find them yourself, you can tag the article with the templates {{Unreferenced}}, {{Not verified}}, or {{Primarysources}}. It's often useful to indicate specific statements that need references by placing {{fact}} ("citation needed") after the sentence, but be careful not to overuse these tags. Don't be inappropriately cautious about removing unsourced material.

To summarize the use of in line tags for unsourced or poorly sourced material:

1. If it is doubtful but not harmful to the whole article, use the {{fact}} tag to ask for source verification, but remember to go back and remove the claim if no source is produced within a reasonable time.
   
2. If it is doubtful and harmful, you should remove it from the article; you may want to move it to the talk page and ask for a source, unless you regard it is as very harmful or absurd, in which case it shouldn't be posted to a talk page either. Use your common sense.
   

All unsourced and poorly sourced contentious material about living persons should be removed from articles and talk pages immediately. It should not be tagged. See Wikipedia:Biographies of living persons and Wikipedia:Libel.

• For advice about what to link and what not to link, see

Wikipedia:Make only links relevant to the context (avoiding overlinking),

Wikipedia:Manual of Style (links)#Internal links, and

Wikipedia:Manual of Style (dates and numbers)#Date formatting.

• Useful links that are not mentioned in the prose paragraphs can be added to the "See also" section.

• Linkifying

Internal wikilink – [[topic]]

External link – [http address] (Turns into a footnote only, unless address followed by " anchortext".)

Categories – [[:Category:Category name]]

Images – [[:Image:abcde.jpg]]

Templates – {{tl|name}}

• Subst:ing

When using template tags on talk pages, don't forget to substitute with text by adding subst: to the template tag. For example, use {{subst:test}} instead of {{test}}. This reduces server load and prevents accidental blanking of the template.

• Subpage linking feature

• Main article linking — {{Main|target article}}

Redirects, including reason tags
Redirect formula: #REDIRECT [[Insert destination title text]]
Disambiguation pages
Disambiguation template {{tl|Disambig}}

Help

Basic how-to · Editing help · Manual of Style · When to link · Footnotes

Tasks

Copyedit · Wikify · Merge · Cleanup · NPOV disputes · Speedy deletions (Criteria)
Deadend pages · Typos · Disambiguation pages maintenance (Manual of Style)

Tools

Wikipedia page history statistics

Aviation-related references

Pilot's Handbook of Aeronautical Knowledge (FAA Edition)

Pilot's Handbook of Aeronautical Knowledge (Canadian Edition)

Virtual classroom

Wikipedia:Disputed statement

Wikipedia:Notability (people)

Assistance for non-native English speakers

Wikipedia:Local Embassy

b:         Wikibooks

commons:   Commons

m:         Wikimedia

q:         Wikiquote

s:         Wikisource

w:         Wikipedia

wikt:      Wiktionary

(see Web colors#X11 color names)

Help:User style
Cascading Style Sheets
Catalog of CSS classes

Troll-o-meter checklist:

• Excessive use of CAPITALS – ??
• Abusive toward other editors – ??
• Crusading on a single issue – ??
• Cites using external links – ??

Scoring:

Three out of four “checked”: Strong cause for suspicion.

Four out of four “checked”: No doubt left.

(Stolen from Guy, with all due appreciation.)