Most users prefer updating directly on their device. Before starting, back up your data using iCloud or a computer to prevent any potential data loss. Update your iPhone or iPad - Apple Support
Keeping your devices current is the best way to ensure they remain secure, stable, and packed with the latest features. Whether you are looking to for an iPhone, iPad, or Mac, you can choose between wireless "over-the-air" methods or using a computer for more control. How to Download Updates on iPhone and iPad download apple software update