System will not boot up and safe mode no matter what commands I try

To boot into Safe Mode follow the directions in How to use safe mode on your Mac.

Pay particular attention to Note 2 below.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following: 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

What is shown is support.apple.com/mac/startup

That’s a web address.

That web address in a web browser gets you to a webpage explaining the common startup errors, what is shown for each, and what to do next.

There is some additional startup troubleshooting info here: Mac Basic Startup Troubleshooting Steps - Apple Community

Which of the listed startup errors are you encountering with this Mac? Which Mac, too?

Start up your Mac in safe mode

Start up your Mac in safe mode - Apple Support