How do I update my phone?

Update your iOS device

Get help with over-the-air iOS updates

Update – Can’t or can’t restore

An iPhone 6 can't be updated tp IOS 13. You should be able to update to IOS 12.

iOS 13 and iPadOS are compatible with these devices - Apple Support

Danaalaqra Said:

”How do I update my phone”

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Update Your Apps:

An update can be for an app. So, in theory, you can update an iPhone, by updating its installed apps.

Everything should be safe and up to date. Check with the developer, for whatever the update: no where else.