This page explains how to get online via a wireless connection with your Nintendo Switch.
How to connect Bluetooth headphones to Nintendo Switch
tinfoil doesn't connect to wifi can someone help me? : r/SwitchPirates
Nintendo Support: How to Set Up a Router's Port Forwarding for a Nintendo Switch Console
How To FIX Nintendo Switch OLED Internet NOT Working! [won't connect to WiFi SOLVED]
What Is a Network Switch, and Do You Need One?
Internet connection (with a wireless connection), Nintendo Switch Support
How to connect a Nintendo Switch to your TV
Everything you need to know about Nintendo Switch Online
How to Connect to the Internet - Nintendo Switch Guide - IGN
How to Connect to the Internet Using a Wired Connection, Nintendo Switch, Support