I found a blog post about torghost, I am wondering if this has some potential harmful software or have some potential risk in using it.
A soft will do what for it's designed to.
Maybe more, maybe less! But for ensuring this, you have to read sources.
So if sources are readable, this is already a good thing: You just have to read them! ... Ideally, once readed and validated, you have to compile the soft yourself, with a trusted compiler, before using the soft.
But if sources are closed, you just can't make your own opinion. You have to trust third party.
Source are available at https://github.com/susmithHCK/torghost, the main part is a python script, less than 180 lines length.
This seem easy to validate (even if this post don't).
I'm the developer of TorGhost. It's 100% safe, and it doesn't contain any malicious code. Don't worry.
Here is the link to the tutorial: TorGhost – channel all traffic through tor network in kali linux.