Blog Tour is a 2 week tour with promo only posts, excerpts, reviews, guest posts, top ten lists and interviews stops.
Book Blitz is a 1 week tour with promo only posts and excerpts and often have reviews as well.
Cover Reveal is a one day event to reveal the cover for a book.
Review Opportunity is an opportunities to review a book, there often is no deadline for these.
Bookbloggers and Bookstagrammers can join all tours, if you don't have a blog or Instagram account you can join review opportunities only.