Welcome to Android! Here are some differences between your old iPhone and your new phone.
Your assistant: You've retired Siri. Now, find info and get things done with Google Assistant. Just set up “OK, Google”. Then ask for info or help with everyday tasks.
Apps:
Your home screen: Your old phone showed all apps on your home screen. With your new phone, you can put shortcuts to your most important apps on your home screen for easy access. This frees up room on your home screen for widgets, making your new home much more lively.
In the cloud: Your Google account is your key to cloud storage with Google. If you migrated your contacts to your phone, then you can see them from any device or computer by logging into Gmail. Your Google account includes apps like Calendar and Drive that let you work well with others. And it has apps that let you play too - access your photos, videos, music from any device when you log in with your Google account. Use Play Music to upload your iTunes library.