Once you start exploring Photoshop, you'll realize that removing image backgrounds is a crucial skill to mastering the program. This can be done using several tools, but there are also other ways. One of the more advanced techniques is to use a Brightness/Contrast Adjustment Layer. This is a good option, for example, when you have an image with silhouettes that you're trying to isolate from a bright decorative background. By pushing the Brightness and Contrast levels to the maximum, your background will likely turn white and make it much easier to delete using the Magic Eraser Tool or other method. Just a tidbit to look forward to when you're ready!
Saving Files - When and How
Imagine creating your first complex project in Photoshop, like a collage. You work for about an hour, carefully arranging and editing your images, but you don't remember to save the file. All of a sudden, the program crashes and all your work is lost. Make it a practice to save Photoshop files about every 10 minutes, so that this common occurrence, known to all designers, does not happen to you. Now let's take a different scenario. You decide to save the collage file to a flash drive that contains various other types of files, so as not to use hard drive space and for ease of travel. The collage is finally done, and you're ready to save the updated file - but wait - you get an error message saying that the flash drive is full! Photoshop files can be hundreds of megabytes, so even large flash drives can be used up quickly. An alternative is to get two external hard drives, preferably in different colors; use one for current work and the other for backup...