Modding on the Nintendo Switch 1 is technically possible in a very limited capacity, but it requires jailbreaking your Switch, which is only possible on select models or by physically altering the hardware of your Switch, and can run the risk of bricking your console and/or being banned by Nintendo. Only visual texture and dialogue replacer XNB mods can be installed. Due to these limitations, most people don't provide guides on how to mod the Switch itself, and it is up to the individual if they want to take these risks.