Power pins, SPI pins, and RESET pin must be connected between arduino and LoRa module. For SX126x series and LLCC68, a BUSY pin also must be connected. If you want to use interrupt operation, you can connect DIO0 for SX127x series and one of DIO1, DIO2, or DIO3 pin for SX126x series. You also should connect TXEN and RXEN pins if your LoRa module have those pins.

The default Arduino pins used for connecting to SX126x and SX127x are as follows.

To change Arduino default SPI port or SPI frequency call setSPI() method before begin() method.

LoRa.setSPI(SPI2, F_CPU/2);
LoRa.begin();

To configure I/O pins (NSS, RESET, BUSY, IRQ, TXEN, RXEN pin) call setPins() before begin() method.

// set NSS->10, RESET->9, BUSY->4, DIO1->2, TXEN->8, RXEN->7 for SX126x series
LoRa.setPins(10, 9, 2, 4, 8, 7);
// set NSS->10, RESET->9, DIO0->2, TXEN->8, RXEN->7 for SX127x series
LoRa.setPins(10, 9, 2, 8, 7);
LoRa.begin();