In macOS Catalina enhanced dictation is now part of Voice Control as part of your Mac's Accessibility features. It has several improvements over previous version of macOS dictation, including several ways to work to correct text, move the cursor, make selections and type difficult words.
Dark Mode in macOS Mojave is a great new feature, but Apple didn't give us a way to quickly switch between light and dark modes. The little donation-ware app NightOwl gives you that control in your menu bar. You can also set a keyboard shortcut, select apps to stay in light mode, and set specific times to switch between modes.