An example application showing how to use Kendo UI components alongside Twitter Bootstrap is available for review here. You could further download the code and examine the solution in detail.
I would also suggest reviewing the Getting Started guidelines. There you would find a step-by-step tutorial on how to include Telerik UI for ASP.NET Core in an application. Next, you could check the sections on Html Helpers or Tag Helpers. They provide further guidance on initializing and customizing the Kendo widgets. Make sure to also check the Demo section for runnable demos of common scenarios.
I hope this helps. Let me know if you have further questions.
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