Life is a journey led by a few breaths. One day will pass and we will be left with three things, one of thim is “useful knowledge.” Allah's Messenger (ﷺ) said: "When a son of Adam (i.e. any human being) dies his deeds are discontinued, with three exceptions: Sadaqah, whose benefit is continuous; or knowledge from which benefit continues to be reaped, or a righteous child who supplicates for him." [Reported by Muslim].