Bill,
It takes some time to become familiar with what it can do. I have a premium account but the basic account does a lot. Here are some of the key features that I like. First, you can create notebooks and save things in individual notebooks. I create a new notebook for every trip I take. I have separate notebooks relating to the Oliver--maintenance, storage, mileage log, etc. When you create a note or save a PDF, a web page, etc., you can choose the notebook to save it to. You also have a dedicated Evernote email address. You can use this to forward or copy emails directly to Evernote so you can save them in the appropriate notebook. I use an Evernote extension in my Chrome browser. When you are at a website, you can use the extension to clip the web article, a simplified article, the web page, a bookmark or a screenshot. This is a great feature.
I noticed on the website that they have added a "Plus" account that adds: "Access notes from all your devices. Access all notebooks Offline on your mobile device. Save important email in Evernote" This costs $35 per year. I think being able to access notes on your SmartPhone or Tablet when you don't have internet access is a great feature.