On your keyboard, press Option + Command + Shift + V
This is a great short cut to use when you need to copy text from one source, paste to another and do not need or want the original formatting. (no fancy headers and or fonts or links). This will paste the text into the formatting that you have in your working document. Basically, this is pasting and matching the style.
I am going to copy information about the new iPad Pro into a Google Doc.
This is the text from the Apple web site:
I copied the text and used the usual Command V to paste into my Google Doc. Then I used Option Command Shift V to paste again.
Note the differences in font size, spacing and font color and links. Using the Option, Command, Shift, V puts the text into my default formatting in my Google Docs.