Is it good to install kali linux on DOS Direct without virtual or bootable

Question

please help me??

Answer 1

I did. It's working fine with windows dual boot but it deleted windows boot manager and replaced it with grub so I need to reinstall my windows.

Answer 2

It's not advised to do it.
Since kali linux is penetration focused, you don't exactly want to leave traces of what you do/did in case you get compromised. So, installing it in your main drive, whether as your primary OS or as your second one isn't exactly safe.
Then there's the chance of you getting attacked too and having some malware running hidden on the background compromising your security and privacy as well as performance.
Another exemple is hardware ID which is a form of identification gotten from your unique setup (for example, Mac Address + CPU serial number + GPU serial number + HDD/SSD serial number, etc), if you have kali on the same disk as your main OS, no matter if you have vpn or a proxy, your hardware ID will be the same for both OSs on some systems (altough you can spoof your Mac Address and serial numbers), so it's best if you have kali on a seperate disk.
Overall it's probably best if you use kali as a Live OS on a large enough memory stick because it will reset its data every time and practically leave no traces in itself.