Want to create a website who gets data in real time

Hi, I want to create an informative website who gathers data from another source, like this website: Garita Center Reporte Garitas Tijuana Línea San Ysidro Otay
This website gathers data from the CBP website and shows it in a more clean manner. How they do this and what I need to learn to do the same?
Thanks for your attention, your answers will be aprecciated.