In general, follow the AP Stylebook. These are exceptions and additions.
B corporation, C corporation
banned phrases – “smooth” (referring to alcoholic burn), “tasty”
B2B, B2C
bricks-and-mortar (adj.)
cyber attack
dashes (– or —, and use spaces on either side)
FAQ (use a not an)
hashtag
headlines (avoid smart characters b/c WordPress may garble them, use Title Case and capitalize prepositions of 4 or more letters)
internet
italics (use them for titles of works, such as books, and publication names)
“like” (use quotation marks only as a noun: Facebook “likes”)
#1 (not No. 1; in lists, use 1., 2., etc.)
[PDF] (use after links that prompt a PDF download)
periods (one space after a period, not two)
Q&A (not Q-and-A)
QuickBooks
quotation marks (use double quotes in headlines)
serial commas (use them)
sex (avoid references to sex of any kind)
social media (takes a singular verb; do not hyphenate when used as an adjective [social media network])
sync, synced
tabs (never use tabs for online work)
ways to (use sparingly in headlines)
web, webpage, website