What are the spectroscopic technics used in biological chemistry or biology ?

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Adam B Shapiro

That is really too big a question to be answered here, since there are many techniques. You should look for some recent textbooks. A few important methods are:

nuclear magnetic resonance spectroscopy
fluorescence spectroscopy
ultraviolet-visible absorbance spectroscopy
mass spectrometry
circular dichroism spectroscopy
infrared spectroscopy
Raman spectroscopy
electron paramagnetic resonance spectroscopy

Adeyemi Oluwadare Ayodeji

Just like Dr @Adam B Shapiro stated, this question is too generic. Get to the specifics based on your RESEARCH interest to avoid dealing with techniques not relevant to your study.