Nintendo Switch system software updates are important: they add new features and fix bugs. Normally, the system automatically downloads updates and asks if you want to install them. But if you want to manually trigger the process (or make sure you are in the latest version), here it is.
To update your Nintendo Switch system software, you must be connected to the Internet. When connected, start System Settings by tapping the gear icon on the Switch Home screen.
In the list on the left of the screen, navigate down to System and then select "System Update."
If your software is already in the latest version, you will see a screen that says "Your system is up to date." But if there is an update available and it has not been downloaded yet, it will start downloading. If it has already been downloaded, the update process begins.
First, the system warns you that the console will be restarted when the update is complete and all suspended software will be shut down.
Warning: Make sure you have saved your progress if you run some games in the background!
When you are ready to restart, select "OK."
You will see a screen that says "Update" showing that the update is in progress. Make sure you do not turn off the console during the update.
When the update is complete, your Nintendo Switch will automatically start.
After restarting, run the latest version of the Nintendo Switch system software. Visit System Settings> System> System Update again to check. If you see a screen that says "Your system is up to date", you're good to go!