My 05 Honda Civic is shaking while driving,?

It is a hybrid manual. As I was driving it began to shake, vibrate non stop. If I am at 20 or 60 it shakes. Why? My neighbor said I might have hit a pothole or something but I do not remember. What could it be?
Added (1). I went outside and tightened the nuts on it and a few where really lose. Hopefully it works.

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