Most people who really rack up frequent flier miles earn them on the ground. Travel HAcking is getting a sh!t of miles for not too much effort or cash monies. However in the past it's taken up time.
There is a guy with a travel blog who has a goal of visiting every country in the world. To meet this goal he travel hacks and blogs.
You can join
trial his hacker blog for 14 days for $1! I just signed up, I hope to beef up our HM FF miles super fast as we're almost there.
Also it's called a travel cartel, which is sorta love.
PS I get 500 miles as a referral, I thought I would be honest. Although I am honestly really excited to share so you can travel! Yay come to Europe!