Do I need to add javascript source of _ValidationScriptsPartial.cshtml to _layout.cshtml?

I am learning APS.NET 5, following the tutorial https://www.microsoftvirtualacademy.com/en-US/training-courses/introduction-to-asp-net-5-13786?l=0pzyl3pXB_9501937557
The default project has a file named _ValidationScriptsPartial.cshtml by default.
<environment names="Development"> <script src="~/lib/jquery-validation/jquery.validate.js"></script> <script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script> </environment> <environment names="Staging,Production"> <script src="//ajax.aspnetcdn.com/ajax/jquery.validation/1.11.1/jquery.validate.min.js" asp-fallback-src="~/lib/jquery-validation/jquery.validate.js&q ...