How can an e-book downloaded into kindle sd card be read in kindle fire?

To read an e-book downloaded onto a Kindle SD card on a Kindle Fire, you can insert the SD card into a compatible card reader or adapter and connect it to the Kindle Fire via the micro-USB or USB-C port. You can then access the e-book file from the SD card using the file manager on the Kindle Fire and open it with a compatible e-book reading app or software.