Terminal sudo dd error while making a bootable drive
It is very important to get the spaces correct in the command. Try cut-n-pasting the command from here:

sudo dd if=/Users/vanshyadav/Desktop/kali-linux-2018.1-amd64.iso of=/dev/disk2 bs=1m


Note that only regular spaces should be used.

You seem to have either forgotten the space, or used some other space-like character - therefore you get the weird error message where "/dev/disk2 bs=1m" is somehow used as the device name (i.e. the dd commands thinks that the bs parameter is somehow part of your device name).