Assuming you have custom firmware (Luma3DS + Boot9Strap), you will need a CIA installer. The most popular is .
Modern 3DS tools like FBI allow you to install games via . This bypasses the need to take your SD card out of your console and move large files manually. Many reputable repositories provide these codes for convenience. Step-by-Step: Installing Your Downloaded CIA Files Download the desired .cia file to your computer. download 3ds cia files upd
A "deep feature" goes beyond the surface of a news story to explore the narrative, "why," and "how" of a topic. Since your interest is in , a deep feature would explore their role as the "digital cartridges" of the homebrew world. Assuming you have custom firmware (Luma3DS + Boot9Strap),