how to sage a file [closed]

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I have Windows 10 installed and i can't sage a file example.sage which is in K:\sageexample Tutorial is extremely bad and full of jargonisms and no examples in it. I don't know what does it mean to sage a file, or to run a file without example being given. I open sage command prompt and type the following run ('K:\sageexample\example.sage') but it returns ERROR:root:File u'(K:\\sageexample\\example.sagetex.sage).py' not found. then i use load ('K:\sageexample\example.sage") it returns nothing at all. I spent three days trying different combinations of syntax with no result.