I’d start with the fundamentals rather than trying to configure everything immediately. First, understand what an emulator actually does and how it reproduces aspects of the original console hardware. Then learn the difference between cartridge-based images and installable software packages, because that will make terms such as NSP and XCI much easier to understand. After that, you can look into compatibility, controller configuration and graphics settings. It’s also useful to read emulator documentation and preservation discussions, since they usually explain the terminology in much more detail. I came across https://switch-rom.me/ while looking through information related to Switch software and emulation, so it may also be worth checking as part of your research. If you’re working with backups, make sure you use software you legally own and are entitled to preserve. Taking everything step by step is much less confusing than trying to understand every technical term at the same time.