If you mean TTY then you dont need to get system information that way.
I can just input inxi -Fazy into your regular terminal.
As to how to get to TTY or runlevel 3 when needed then the steps are outlined in guides like this one:
Ctrl+c is a common invocation for cancelling a currently running process in the terminal.
(example: ping google.com … wait a bit, hit ctrl+c … and it stops)
Ctrl+Alt+Fx (where x is a number, so F1, F2, F3, etc) is usually what we would use to drop to TTY from a currently running system. Such as from your desktop.
(note these numbers can vary - I believe Plasma desktop now boots into TTY2 [so ctrl+alt+F2] by default. Meaning in that case ctrl+alt+f3 would be a TTY, and ctrl+alt+F2 would bring you back to the desktop.)
The e part you are referring to is probably for editing boot options during boot . so this means at grub when selecting a kernel you would press e to edit … then make changes. Such as adding 3 to the options to boot into runlevel 3 (no gfx) as outlined in the guide above.