After watching some tutorials and messing around the interface, I got used to the PlatformIO workflow. After some troubleshooting, I figured out Visual Studio Code's user interface. It has a small bug where the window would be unable to be typed into when I clicked on a button on the left panel. I hope these small bugs will get fixed soon. The port of the blink sketch from Arduino to PlatformIO was a success.

Fig. 1 -  PlatformIO in Visual Studio Code