This is the bread-and-butter of using Word. It is, after all, at its core, a word-processor.
Here's how to zoom in and out, how to format text, and so on.
(When I started using Word, I had no clue about formatting, how to select text, how to change or reformat it. I remember needing to send a letter so just started typing into the document.
Unbeknown to me, it was a Heading style and my final letter was Arial, font size 18, and bold.
Not the best start, but I did get better!