Can sim card 1 use the wifi hotspot of sim card 2?

Yes, SIM card 1 can use the Wi-Fi hotspot of SIM card 2 if the device with SIM card 2 is set up to share its mobile data connection via a hotspot. To do this, you need to enable the hotspot feature on the device with SIM card 2 and connect the device with SIM card 1 to that Wi-Fi network. The data from SIM card 2 will be used by the device with SIM card 1 when connected.