What important idea from Thomas Malthus inspired Darwin?

Darwin harbour was discovered in 1839 by capitan of the beagle jonh lort stlke, who named it after a former shipmate, british evolutionary of charles darwin

Not 100%, But in my biology class we discussed this at the beginning of the year. Darwin believed in survival of the fittest. Thomas Malthus believed that there are a lack of resources (food) because of over population.