In case of larger scripting projects advanced debugging facilities and the organization of source code in neatly separated files makes life easier. Integrated development environments like Microsoft Visual Studio offer these possibilities – and some more. The “Community”-version of Visual Studio can be downloaded for free from the Microsoft web-site.
A useful GH related tool for Visual Studio can be found at: https://marketplace.visualstudio.com/items?itemName=McNeel.GrasshopperAssemblyforv6
It contains project and component wizards which take care of the project settings and boiler-plate code necessary to create valid GH-components.