Knocking in my 02 Taurus

noise in the front when hitting small bumps is that the struts or something else

A broken stabilizer bar end link will cause a knocking noise when going over bumps.

Tester

Is that major work and dangerous if not fix soon

It could also be caused by a bad lower ball joint. Anything related to stabilizer bar end links or ball joints is a safety issue and should be repaired quickly.