Set up a blog. These are a very good method for getting traffic to your site and they are free. You can start one at one of many free blog sites. Then you set up a feed for content and then go to other blogs with the same topics or fields of interests and read and comment on their articles. As well a lot allow you to post your article which gives you more traffic.
Not all web traffic is welcomed. Some companies offer advertising schemes that, in return for increased web traffic (visitors), pay for screen space on the site. There is also "fake traffic", which is bot traffic generated by a third party. This type of traffic can damage a website's reputation, its visibility on Google, and overall domain authority.