The idea of evergreen content is that it is essentially unchanging, intended to last “a long time,”and have little or no maintenance. So isn’t updating evergreen content a bit of an oxymoron? In some cases yes, in some cases no. …

Evergreen content is probably the most valuable kind you can create. It has a long shelf life, and can continue to drive traffic to your site for years. How-to articles are perhaps the most logical choice when creating content that you want to work for your site for this kind of time frame.