If you want to copy formatted text from one document into a new one but don’t want to keep the formatting, you can do so with a simple keyboard shortcut.
Simply copy the text as you normally would (Command + C), then move to where you want to paste the text and hit Command + Shift + Option + V. Your text will be pasted with no formatting whatsoever.
This is particularly useful when copying colored text with one font and pasting it into a new document that uses completely different fonts and colors.