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That entire model was deprecated some time ago. They went to an entirely js+rest model and no longer allow deploying code to the server. This was done to enable it to be a viable cloud offering.
If you plan on sticking with SharePoint as a career path (do not recommend), you're going to want to pick up Angular and typescript. They have a react option, but the component library they use is barely functional in it.
Earu149dWell I'm already familiar with typescript and react, it wasn't exactly my choice to stick with SharePoint as you may have suspected. Time will tell if this is going to last I guess...