This page explains how to get online via a wireless connection with your Nintendo Switch.
Help! Switch Lite Wifi not working. : r/consolerepair
CableCreation USB 3.0 to Ethernet Adapter, USB to RJ45 Network Adapter Support 10/100/1000 Mbps Gigabit Compatible with Nintendo Switch, MacBook, Windows, macOS, Linux, Chrome OS, White : Electronics
Requirements to Connect Nintendo Switch to the Internet - Support - Nintendo
Wi-Fi not working? How to fix the most common Wi-Fi problems
How to Connect to the Internet Using a Wired Connection, Nintendo Switch, Support
HOW to TURN ON/ OFF WIFI on NINTENDO SWITCH LITE?
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How to Improve Internet Speeds on Your Nintendo Switch
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Nintendo Support: Requirements to Connect Nintendo Switch to the Internet
How do I switch between a wired/wireless connection? – Netgem Support