Once you’re used to it, you can use the two separate clipboards independently. Say you wrote a sentence like, “one two five four three”, you can correct it by selecting “three”, cutting with Ctrl-X, then selecting “five” (meaning it is now in the selection buffer), hitting Ctrl-V to paste “three” from the clipboard, and then finally middle-click where you need to paste the “five”.
Once you’re used to it, you can use the two separate clipboards independently. Say you wrote a sentence like, “one two five four three”, you can correct it by selecting “three”, cutting with Ctrl-X, then selecting “five” (meaning it is now in the selection buffer), hitting Ctrl-V to paste “three” from the clipboard, and then finally middle-click where you need to paste the “five”.