A quick tip today. If you’re selecting some text with Visual Line mode (V), you can of course use j and k to extend this selection up and down. But did you know that you can use o while you’re in this visual selection to choose which end to extend the selection from?

By hitting o you swap your cursor from the top line of your visual selection to the bottom, so you can extend it both ways. This is useful if you need to extend a selection up by a few lines, and then down from the bottom by a couple of lines too.