There's a stack of money to be made selling your used clothes, tech and household items. According to Gumtree's report into the second hand goods economy, peer-to-peer trading is worth $34b in the Aussie economy. So, how do you get in on some of that action?

You've got your eye on a new iPhone, but there's just one problem: you're still in a potentially contracted relationship with your old device and need to figure out how to efficiently break up before placing your order.

Gumtree has been around for 10 years now - and was well overdue for an upgrade. But it's not just a new look for the site - it's going to be faster and easier to use, with a whole bunch of new features added.

Dear Lifehacker, I have been the proud owner of a Canon 7D camera for the last few years, and have some nice lenses to boot — a 24-70mm Canon L lens, a 30mm Sigma prime, and a 50mm f/1.8 Canon prime. But I'd like to upgrade. I'm eyeing off the Sony Alpha mirrorless cameras, but I don't have the money to just go out and buy something off the shelf. So I was wondering: what if I trade my camera in? Or should I sell it as second-hand on a forum somewhere?

Online classifieds website Gumtree has been hacked. The incident occurred over the long weekend and attackers were able to access some user information. Here's what we know so far.

The iPhone 6s and iPhone 6s Plus will go on sale in Australia next Friday (25 September). If you're planning to ugrade your existing iPhone, you'd be well advised to act before the market becomes saturated with second-hand models. According to Gumtree's latest findings, you could make an extra $200 by selling sooner rather than later.

When you sell your stuff on sites like eBay or Gumtree, setting a price can be a deer-in-the-headlights moment. If you're not careful, you might undercut yourself and lose money. Here's how to figure out what your stuff is worth and get as much money back as you can.

Online auction site Gumtree has admitted to a security breach over the weekend involving a third-party ad which contained hidden malware. Hundreds of customers were alerted to the situation via browser security warnings.

Locl is a new mobile marketplace that allows users to buy and sell products without attracting any fees. You can also put big-ticket items up for auction, including cars and houses. Check out the video to see how it works.

Hey Lifehacker, I am trying to post an ad on Gumtree to sell my car back home in Australia from where I live in Norway. Gumtree only allows Australian IP addresses to post ads and my dad seems to be incapable of posting the ad for me back home.

Samantha Stevens is a motoring journalist, driver trainer and national tarmac rally champion who has forgotten more about cars than most of us will ever know. (Actually, she's so whip-smart we doubt she forgets much of anything.) Last week, we caught up with Samantha during a Gumtree event about online car sales. Here are some of her tips for breaking into the new car market (and staying there)…

Gumtree is one of the most popular local options for selling off unwanted stuff, in part because basic listings don't cost anything. However, bear in mind one restriction: you can only edit your ad up to 12 hours after posting. If you want to make changes after that, you'll have to pay a fee.

If you've been waiting eagerly for a Gumtree app for Android, you can put that eagerness to bed (though perhaps not literally). Owner eBay has pushed out an official option via Google Play, which you can grab free right now.