Write-Debug

As long as a script is an advanced script then you can use Write-Debug.

Write-Debug -Message "Enter debug text here, variables can be included."

The script will pause at each Write-Debug and display the debug text, including any variables. This will display the current content of any variables in the debug text.

To run a script with debugging turned on you must run the script with the debug switch.

.\MyTestSwitch.ps1 -debug

Set-PSBreakpoint

Another method for debugging is to set breakpoints prior to running a script.

Set-PSBreakPoint -Script .\MyTestSwitch.ps1 -Line 5
Set-PSBreakPoint -Script .\MyTestSwitch.ps1 -Variable ComputerName 

https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/set-psbreakpoint?view=powershell-6

Removing PS-Breakpoints

Get-PSBreakPoint | Remove-PSBreakPoint