This is just a little thing and it’s kind of obvious but…
Sometimes you want to select a word, so you double click on it.
Now you’ve got the word selected and probably a space at the end of the word as well.
If you double click and hold down and drag to the left you can select just the word. Drag a bit further and you can select the space to the left. It’s so simple and obvious but I’ve always either double-clicked or dragged from the start to the end, which is just fiddly. I need to get out more :/