This tutorial provides the basics for using a WIZ5500-based Ethernet Shield with an Arduino compatible. The Wiznet WIZ5500 is a modern Ethernet interface chip and is used in the Ethernet Shield W5500 and the Feather Ethernet Wing available at Adafruit.
This tutorial will go through preparing then using the SD card, both in general then reading the files on a card. The final example will show how to access the SD card remotely over Ethernet. This capability could be the basis for a remote file storage or other program that access a remote Arduino compatible.