Either cut & paste the contents of the Terminal window or post a screenshot. If the error occurs when using the Terminal, then make sure to post both the exact command used and the exact error message. If there are any errors when creating a bootable macOS USB installer, then please at what step you encounter a problem and post the exact error message. If there are no errors when creating the bootable macOS USB installer, then try using another SSD (especially another brand) since the quality of USB sticks is extremely poor plus Macs are very picky about the drives used for booting. Make sure to carefully read the instructions and keep in mind if you are creating a macOS 10.11 installer, then there are several extra steps you need to perform before you use the Terminal command. You will need access to another Mac which is capable of running macOS 10.11 to 10.15. The only reliable way of creating a bootable macOS USB installer is by using the instructions in the Apple article I linked previously.

Instal the new for mac Karos