When you start working with PowerShell Modules you often find yourself in having to approve module updates over and over and over.
Install-Module PSWriteWord -AllowPrerelease
While it's great if you don't trust PowerShellGallery I tend to trust that gallery because Microsoft runs it and I only install modules I've verified prior to installation.
To fix this problem simply use command below to set InstallationPolicy to trusted.
Set-PSRepository -Name 'PSGallery' -InstallationPolicy Trusted
That's all. Simple one line of code and you trust PowerShellGallery and can install modules from there without any prompts.