These are the following powershell commands which is commonly used during development, Farm Creation and for Administration:
Backup & Restore
Backup-SPSite -Identity http://ServerName:port -Path “c:\backup\file.bak”
Restore-SPSite -Identity http://Servername:port -Path “c:\backup\file.bak” -force
Add and Install WSP
Add-SPSolution c:\helloworld.wsp
Install-SPSolution –Identity helloworld.wsp -GACDeployment -force -WebApplication http://portal
Remove WSP
Remove-SPSolution -Identity helloworld.wsp
Update WSP
Update-SPSolution -Identity helloworld.wsp -LiteralPath C:\helloworld.wsp -GACDeployment