There are many companies out there who claim they can bring your website up to code in as little as two days. This is simply not possible. It takes going through every page on your website and bringing each variable up to code on that page. It’s not simply a magic button that you press. This could take a single developer many hours if you have a decently sized website, hence the hefty price tag to bring sites up to code.
The words in the tag should be more than a description. They should provide a text equivalent of the image. In other words, the tag should include the same meaningful information that other users obtain by looking at the image. In the example of the mayor’s picture, adding an “alt” tag with the words “Photograph of Mayor Jane Smith” provides a meaningful description.