Hello Hannah_Mae,
Thank you for reaching out in Apple Support Communities. I understand your iPhone is unable to connect to the Wi-Fi network in your home as the password is not being accepted.
Having an established connection with the Wi-Fi network is an important feature to fully enjoy your iPhone. I'll be happy to help.
To help troubleshoot this behavior, I suggest to follow the steps outlined in this helpful article: If you need help with your Wi‑Fi password Specifically the section that says, "What if I know my password, but the network won’t accept it?"
In addition, I encourage for you to verify the recommended settings for your home Wi-Fi, by following the steps outlined here: Recommended settings for Wi-Fi routers and access points
Please let us know if that helps.
Cheers.