What is a heart attack and its signs and symptoms that we should pay more attention to so that we prevent it or know what to do in case this incident happened?

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Cov kab mob ua raws plawv nres yog dab tsi thiab ho muaj cov yam ntxwv mob zoo li cas uas peb tsim nyog kub siab txog kom peb thiaj tiv thaiv tau cov kab mob no los yog kom thiaj paub tias yuav ua li cas thiab thov kev pab cuam dab tsi li cas los yog thaum twg coj los pab cuam rau peb rau lub caij muaj tej xwm txheej no tshwm sim?