Updated June 16th, 2019.
Here’s what the toolbar (at the top of the window) looks like for most people when they open up a Finder window. Lots of buttons.
Here’s how it can look (lots of buttons, with text underneath them):
This is better twice. First, it’s better because the buttons are labeled, which means now you have some idea of what the buttons do, which means you might actually use them. Second, even if you were already using the buttons, now the targets are bigger, because you can click on the label instead of the button. Bigger target = easier to click.
You turn on the labels by holding the Control key and clicking in a blank space in the toolbar. You’ll see this menu:
Choose “Icon and Text” and you’re all done. Experiment with the other options if you’d like.
Bonus: this works for Mail and Preview too.