You might want it to be different from your device passcode too.
Once you’ve set a passcode, Restrictions are turned on.
Now open the Settings app and choose General Restrictions.
Tap the Websites button under the Allowed Content group.
The downside, of course, is that your kid may become bored with using one app, so this option works best with deep, engaging apps that will keep your kid entertained for more than a couple of minutes.
To use Guided Access, follow these steps: Is there a certain website — or a list of websites — that you don’t want your kid visiting?
This is probably the simplest weather site in the world, because it only answers one question. But I want to know what you think: what are the best weather apps that are also amusing in some way?