So I've read through several tutorials on how to expand the file system when using an external hard drive. They seem very complicated. The Pi 3 makes it easy to boot from a USB drive, but is there an easy way to expand the file system? The most detailed (and trust-worthy?) instructions seem to be here: https://elinux.org/RPi_Resize_Flash_Partitions
But it's pretty complex. I was wondering why there Rasp-config's tool to expand file system isn't made to also work for USB drive? it only works for SD cards.
Anyone know any good tricks for doing this?