InDesign and InCopy's Paste Without Formatting command (located in the Edit menu) is often overlooked. This command is really useful in at least two situations.
1. Imagine you have a 60 pt Bodoni headline and some 12 point Myriad body text. If you select a couple of words of body text, and try to paste it in the middle of the headline, the pasted text will appear with the 12 point Myriad formatting, when the desired result is probably to adopt the formatting of the headline. This where Paste Without Formatting comes in. All you have to do is copy the body text normally, then use Edit > Paste Without Formatting to paste the text into the headline. The formatting of the body text will be left behind, and the text will adopt the formatting of the new cursor location.
2. This command is also useful when pasting from other programs like Word, Excel, or email into InDesign. If you choose Preferences > Clipboard Handling, and choose "When Pasting Text and Tables from Other Applications, Paste: All Information" when you copy text from Word and paste it into InDesign, it will bring the formatting from Word. But if you choose Edit > Paste Without Formatting, it will leave the Word formatting behind and adopt the formatting of the text cursor location.
You probably already know the keyboard shortcut for Paste (Mac: command-v, Windows: ctrl-v). The shortcut for Paste Without Formatting is easy to remember. Just add the Shift key. (Mac: command-shift-v, Windows: ctrl-shift-v).