Let others use your articles, along with your byline which will tell visitors who wrote it and how they can contact you, on their website.
This will help to promote your own website and bring you in traffic through the search engine optimization and promotional efforts of others. For you this means absolutely free marketing just for writing a quick article about a subject that you are already familiar with.
The more people who use your article as content as their website, the more potential traffic you will receive. These webmasters will probably be using SEO techniques, banner exchanges, and possibly even a Pay-Per-Click campaign to get visitors to their affiliate site.
These are advertising methods that either take a lot of time or a lot of money and they will be absolutely free for you just because you placed your articles where others could use them. There are many places on the Internet that offer to post your article so that others may view and/or use it.
My advice is to place your articles on every single one of these sites so that you can reach as many webmasters as possible.