In the very top right corner of the Menu bar on Mac computers, there is a "Spotlight" icon:
You can also press Command + Spacebar on the keyboard to open the spotlight search window
After clicking on this icon you should see a Spotlight search bar. Search this bar for quick access to open applications, specific files, folders, email messages, dictionary definitions and more.
Just click on the results to launch an application or open an a file. If you don't see what you want, click on "Show All" to open a Finder window of results.
For more great tips on how to use Spotlight to search your computer, check out Whitson Gordon's article on Lifehacker: All the Awesome Spotlight Shortcuts You Didn’t Know Existed
One of the tips from this post:
Make Advanced Search Queries
- You can search for files of a specific type by using the kind operator, e.g. invoice kind:pdf.
- You can search for files from a specific date range using operators like created or modified, e.g. invoice modified:yesterday for something modified yesterday, or invoice created:1/1/2012-4/10/2012 to find something created in between January 1st and April 10th.