One space After Full Stops not two Its always been a big question, so here is the answer.
Use only ONE space after Full Stops (Periods), colons, exclamation marks, question marks, quotation marks—any punctuation that separates two sentences. Characters on a traditional typewriter are given the same amount of space which is where the two space rule came in. On a Mac, the characters are proportionally spaced, so an m doesn't take up the same space as an i or e for example.
Use real quotation marks—never those generic marks that actually symbolise inch or foot marks: so use “ and ” , not " and ".
Using InDesign, do one of the following: 1) Turn off the Use Typographer’s Quotes option in the Type section of the Preferences dialog box, and then type the quotation mark or apostrophe. (Use the shortcut key strokes displayed on the Insert Special Character menu to add quotation marks.)
2) Choose Insert > Glyphs, and then insert the straight quotation mark.
3) Press Shift+Command+Option+' (Mac OS) to toggle between turning on and off the Use Typographer’s Quotes preferences option.
Do not use hyphens to substitute as dashes. Use en and em dashes instead.
Hyphens ( - ) are used for hyphenating words only. No more than two lines in a row should be hyphenated. Never hyphenate a word in a heading.
En dashes ( – ) are used for any indication of duration (Monday –Friday, 9 – 5 p.m., 2008 – 2009). On the keyboard, this is OPTION - Em dashes ( — ) are used in a manner similar to a colon or parentheses.
More tips coming soon