The average person these days likely has many tens if not hundreds of username / password combos that are saved by (and even created by) Chrome or Safari. If you use both browsers you probably want Safari to be able to use the login info that you have stored in Chrome and vice-versa, because it can become a nuisance when you are trying to log into a service on Safari but you don't know the login because you originally created it with Chrome. Luckily macOS Catalina 10.15.4 (and above) lets you easily import your Chrome passwords to your iCloud KeyChain. Here's how to do it:
Your iPhone automatically remembers Wi-Fi passwords and will automatically join known networks, unless you have that feature turned off. There are instances when you want to be able to see these stored Wi-Fi passwords so you can get on the network with other devices. Unfortunately there is no way to view your iPhone's remembered passwords on the phone itself. You can, however, use the Keychain Access application on your Mac to view your iPhone's stored Wi-Fi passwords. Here's how to do it:
Though it has been around for several years now (since iOS 7.0.3), the iCloud Keychain is still new to some, and remains a source of confusion for others. If you are new to iPhone, or just haven't ever bothered with iCloud Keychain, it serves as a basic manager for your web logins (via Safari), your credit card information, and Wi-Fi network login information, and it keeps your Mail, Contacts, Messages and Calendar up to date across your devices as well. It will keep this information safely encrypted and allow access to it from your other iOS and OS X devices.