Apple's iPhones are pretty famous for being closed off, with jailbreaking being the only way that most people can imagine sideloading apps. However, there are other ways to sideload apps onto an iPhone, and the easiest way is through AltStore.
AltStore is, as the name implies, an alternative app store for iOS devices. Made by Riley Testut, it's the easiest and safest way to sideload apps on your iPad or iPhone. It doesn't rely on enterprise certificates that Apple has been cracking down on, and instead makes use of a feature Apple introduced that lets you install up to three apps for free using your Apple ID.
You'll need to trust the developer certificate in your device settings, but when you do, any apps that you install through AltStore will work... for seven days. Apple has put several restrictions in place to make the process as difficult as possible, but the developer managed to work around those restrictions.
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How to easily sideload apps on any iPhone using AltStore#
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AltStoreIf you want to sideload apps on your iPhone, there aren't a lot of options. Thankfully, you'll only need AltStore.