Component Lifecycle: Mounting

There is no mounting phase in server-side rendering
In server-side rendering, componentDidMount is not called
In server-side rendering (SSR), the componentDidMount lifecycle method is not called on the server. The component is rendered to HTML on the server, but the componentDidMount method only executes when the JavaScript loads and the component 'hydrates' on the client. This is because componentDidMount is specifically for interacting with the browser DOM, which doesn't exist on the server.
In server-side rendering, render is called twice
Server-side rendering doesn't support class components