I forget my password for my iCloud

Click->If you forgot your Apple ID password - Apple Support

Click->If you forgot your Apple ID - Apple Support

Click->If you forgot the answers to your Apple ID security questions - Apple ...

iOS / iPadOS devices cannot be hacked or infected with Virus / Malware / Spyware, unless you have intentionally downloaded spurious softwares or unauthorised apps directly from internet and installed on your device or/and have Jail Broken. 

It also depends on how careful are you in sharing the sensitive and valuable informations of your iPhone such as Passcode, Password etc with your friends and family members.