Clicking a Blog Category = INTERNAL SERVER ERROR

Greetings:

I am brand new to this forum, and in using blogs. I accepted WordPress through my hosting service. Well, to keep things short, here is the crux of my problem:

I installed WordPress. I addded content. I created categories. Now, when I click on the categories (or page links) I get this error:

QUOTE
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Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
———–
END QUOTE

Q.1 How do I resolve?
Q.2 Where is the above mentioned server error log kept or recorded?

The (newbie) blog is at: https://www.journal.suppan.net
Try clicking on any of the categories.

Oh, and I did do a search in the forums first before posting. (search: “internal server error” “500 error” etc.) but not much information on how to resolve.

Thanks much for you valuable time.
Jerry
Tokyo, Japan