If you can not afford to pay for advertising you can try link exchanging but most likely you will not gain no traffic or very little traffic from a portion of the sites that you exchange links with. If you do decide to exchange links with other websites check there ranking find out how much traffic they average daily. Traffic exchanging is a good way to start gaining traffic. Below are very good sites that will help you gain or bring traffic to your website or business for free.
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Below are some traffic exchange sites i use.
Here are some more useful sites i use to get traffic.