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I'd recommend reading https://world.episerver.com/documentation/developer-guides/commerce/getting-started/creating-a-start-page/ which is the offical docs rather than a 2 year old blog post. Do you have the commerce routing set up?
https://world.episerver.com/documentation/developer-guides/commerce/routing/
I am trying to create controller fro commerce as explained in the link below. However, I am getting NULL exception in the parameter of action. e.g.
currentContent is null in
https://world.episerver.com/blogs/sorby/dates/2017/9/add-commerce-to-an-alloy-web-site/