It's merely a tech question, but what language do I use t create a Webpart, that later I want to add on my SharePoint page? I just have to create a basic Webpart design and integrate it on the page.
SharePoint is an ASP.NET application and platform, thus any .NET (CLR) enabled language will do. However C# is "the" .NET language, thus I suggest you to use that.
https://docs.microsoft.com/en-us/previous-versions/office/developer/sharepoint-2010/ms415817(v=office.14)
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