Is It Safe To...?

Thanks for your time guys.

Right now I would be using a generic guitar cable to connect the guitar to the amplifier, and a 10 ft Hosa Pro Cable to connect amp and interface. I’m guessing most guitar cables are unbalanced and of course mono, correct?

As far as y cables, I do have one of this which is stereo in, stereo out.

So what would I need for this to work? Right now I’m hearing three guitar cables (one for guitar to amp and two for the interface) and a y cable. Do they make these for combining mono signals, or will the one above work fine for this?

Please excuse my ignorance and thanks again.