Themes, background images, and layouts are a good way for you to customize your presentation and tailor it to a particular audience. In this lesson you will learn how you can easily set a custom wallpaper, or use a theme that Google Present offers.
If you want to make a clean install of the new OS X Mavericks or even the older versions of Mac OS X, than I strongly suggest you to create a bootable OS X key or a drive.
Let me show you a nice little Chrome trick which I personally find very useful. You will learn how to save all the open tabs so you can view open and view them any time later.