That's a good question, and a common point of confusion for new users!
It seems you're asking about how to change your home directory. In Linux, your home directory is a fixed location assigned to your user account (like /home/labex for the labex user) and is usually set up when the user account is created. It's not something you typically "change" on the fly with a simple command, as it's tied to your user configuration.
However, if you're looking to change your current working directory to your home directory, you can simply use the cd command without any arguments:
cd
This will instantly take you to your home directory, which in this lab is /home/labex.
If you were actually thinking about changing your home directory permanently (which is a more advanced user administration task), that would involve modifying system-level user configurations, not a typical command for daily file operations. For the purpose of this lab, your home directory is /home/labex.
Does that clarify the difference for you? Let me know if you meant something else!