You need an RSS Reader. I use NewsBlur. Feedly is another popular choice. (Google Reader was the king of the RSS readers, but then in a stunningly bad marketing decision, Google stopped supporting it. A bad decision because while the niche is small, those who use RSS are a particular demographic of tech-savvy individuals who influence others, and it highlighted the ephemeral nature of Google’s products; the company may yank them out from under you at any moment, leaving you in a lurch.)
An RSS feed is a record of new postings to a site, generated by that site. It has a distinct URL. You enter a site’s RSS feed URL into your reader (exactly how depends on the reader, but it’s usually obvious and easy), and from then on, new postings to each site you’ve subscribed to appears in the reader.
RSS readers are especially valuable for sites that aren’t updated daily--those you’re not accustomed to visiting every day.