http://macmost.com/e-1329 If you need to grab the entire contents of a webpage, not just the visible portion, you can do so easily with the Export as PDF or Print functions. This saves the contents of the page as a single PDF file, which can be easily viewed offline and on other devices. This comes in handy for students who need to take online notes with them.
http://macmost.com/e-1328 If you’d rather not take your hands off the keyboard to access the Mac menu bar, you can execute any menu command using a keyboard shortcut. You can then use the arrow keys to navigate through the menu items and Return to select one. You can do something similar with the Dock as well.
http://macmost.com/e-1173 Using a trick hidden in the Accessibility features of your Mac you can zoom in to a portion of your Mac’s screen. With El Capitan you can use this zoom feature as a magnifying glass, allowing you to see the screen normally while also seeing a zoomed view in a corner. This can be useful for artists or anyone who needs to focus on a portion of their screen. But it isn’t useful for revealing more detail in an image.