Data Tracking in Node.js and Reactjs

Hello All, I am working on a development project and I want to know which one supports real-time data tracking between node.js and react.js. Yesterday when I search on google to find the difference between them, I found this source and It says, The old technique is difficult to keep track of in React because of the sophisticated design. Can anyone have an idea about node.js? I am good in react but don't have an idea about node.js.