Change Shadow Strength Value

I need help! I need to make a script. This script changes the Shadow Strength, but I have no idea what I do.

I had seen these links, but I don’t got apply the code. Could you help me puttin an example? Thank you.

Link 1 shows an example of the syntax needed to adjust a property of a light, However, as you already have a light, you won’t want to addcomponent to a new object, rather getcomponent on the current gameobject
Link 2 contains the property you want to change

if you need more help, you need to do basic beginner tutorials