How to use Project Wonderful for free advertising

In addition to paid advertising, Project Wonderful also allows you to advertise your store (or site / blog) for free. The system is based on bidding for positions on sites that display advertisements, but often on some sites the positions are not filled, so they are available for free use. The $ 0 bid is limited to a maximum of 2 days, so this bidding system will take you a little longer than when you advertise through a paid campaign, but the price in money is ideal for someone who starts out and has little or no budget