Cookies are tiny files that your browser stores for a variety of reasons. They can keep you logged into your favorite website instead of demanding you re-enter your password every time you click on a new page. They can keep track of your shopping cart to make sure your favorite items haven't been dumped. They can keep track of how many articles you've read. They can also be used to track your movements from website to website.
Often it makes life more convenient to have cookies enabled, but sometimes it doesn't. Maybe the cookie incorrectly identifies you as someone who borrowed your computer the other day. Maybe you don't like the idea of being followed from site to site. Maybe your browser is misbehaving, and you want to try clearing the cookies as a troubleshooting step.
To get started clearing your cookies on Chrome, you're going to click on the settings/menu button on the upper right corner. This used to look like a wrench, but now it looks like the Menu button on Android phones.
Next, you're going to click on Settings.