I am working on my second Arduino project using a Nano and a RFID module with additional devices. Currently I am using pins D11 D12 and D13 for the MOSI MISO and SCK connections to the RFID. If I move the RFID connections to the MOSI MISO and SCK pins in the ICSP header, can I now use pins D11 D12 and D13 as digital pins? I am quickly running out of available digital pins and converted analog pins.
No, the ICSP pins for MOSI, MISO and SCK and pins 11, 12 and 13 are physically connected.
You could use an I2C expander or shift register to add GPIO pins.
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You can have a look at the schematic; it will show what @groundFungus said. https://content.arduino.cc/assets/NanoV3.3_sch.pdf
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