Email alerts are an easy way to be automatically notified when the latest issue of a journal is released. It will usually have a table of contents (ToC) for you to scan through, providing titles and/or abstracts to identify articles that are relevant to your practice.
Are you interested in the latest research around a specific topic, and would like the articles to come from a variety of journals? By setting up a subject alert,you'll receive an automatically generated email when a new article is published related your specific topic of interest. You'll have to start with a search in a specific database.
RSS feeds can be viewed in your email (Outlook), a browser (Internet Explorer, Firefox, Chrome), or an RSS reader. The feed will notify you of the most recent articles published to your followed journals or from a topic search from your favorite database.