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How to calculate the Q value for a high pass filter ? Ps: I'm a beginner in signal processing, so please put it in simple terms.

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You can look at these set of notes provided by Analog Devices as part of their "Basic Linear Design" seminar, or just look for notes on second order filters.

The transfer function of a second order high pass filter is $$H(s) = \frac{A s^2}{s^2+\frac{w_0}{Q}s+w_0^2}$$ where $w_0$ is the cutoff frequency, $Q$ is the $Q$-factor, and $A$ is the gain.

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