Alignment of text can be vital to how readers taken in the data given. There are rules that can help the text to stand out and not get jumbled up. For instance, the left alignment should not be next to a piece of text with a right alignment as it doesn’t look right on a page and makes it look weird!
The “rag” helps the eye to stay interested in the text. Harder to decode because all looks the same. When using justifying always use hyphenations. Central align, type on own in isolation – drags the eye to the middle.