I use it as this is what I was taught to help differentiate my changes from original document on the computer for instance. I am from USA and my parents were teachers. Doing changes written is different from computers but if you have a touch screen then corrections in computer or written can be same for you. If you use word writing software like Microsoft office, open office, word perfect you will see and can do some of the things listed, You have to type then lightlight word with cursor (double click) f and say what you want to do with it. At the top of the corrections you will see a "tool bar". The squares are for different actions you can do b for bold, u for underline, i for italics, abc with line is a strike out (you want to take that out of the entry a word or a few in a row), The first A with a color box is for the highlight and the second is for word color change. Those are the ones I have used and I try to add note if I want to comment for clarification. Hope that helps.