Ubuntu on external HDD

Question

I'm looking for modern tutorial in which described how to install Ubuntu on external HDD and leave a section for storing files on it. And how to install grub on external HDD, not internal.

Answer 1

Go on this two links might be helpful
https://askubuntu.com/questions/953890/how-to-install-ubuntu-on-separate-hard-drive-in-a-dual-boot-with-windows-7

https://askubuntu.com/questions/740253/how-to-install-grub-in-an-external-hard-drive