Because the linguistic meaning of Fiqh is 'to understand', you may understand many things in everyday life.
But technical Fiqh is more specific: it concerns Shari'ah rulings related to human actions.
Understanding a mathematics problem is understanding, but it is not Fiqh in this technical sense.
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Not Every Kind of Understanding Is Technical Fiqh
Because the linguistic meaning of Fiqh is 'to understand', you may understand many things in everyday life.
But technical Fiqh is more specific: it concerns Shari'ah rulings related to human actions.
Understanding a mathematics problem is understanding, but it is not Fiqh in this technical sense.