CMYK does not include a white color because it is assumed that it will be printed on a white paper and depending on the percentage of each color that is used, the white from the paper will be used to fill the space, therefore making the shades appear lighter. If it's something that will only be seen digitally, use RGB.
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Every image editing software has a crop tool that allows you to trim or eliminate the edges of an image. Cropping tools in Ms.word allow you to hide portions of picture that you do not want to be displayed in the final result.
Autofill is to automaticlly put the information in a spreadsheet
The most important reason we should make a backup of our files on a USB or other device is in case our computer suddenly dies. If something in it goes bad and it stops working, you will have then lost everything on your computer. But, if you make a save, you can buy another computer and upload everything onto the new one.