Switching table, and ports?

Question

network hardware

Hello gentlemen.
I am learning to indicate the port belonging to a specific VLAN.
On the screen, the characters are the SW_1 switch to which I connect via PC0 and PC5, the port of which I need to find out
1) I go to PC 5, write ipconfig / all and look at the physical address (MAC)
2) I connect to the SW_1 switch, at the privilege level I enter the command sh mac-address-table
3) And I don’t find the address I need in the table.
But if I connect to the SW_3 switch, it shows me which port PC5 sits on, why is that, did I miss something in theory?