To build a component in Ionic React, you can simply use this template I have here.

import './ExploreContainer.css';

interface ContainerProps { }

const ExampleContainer: React.FC<ContainerProps> = () => {
  return (
    <div className="container">Hello World!</div>
  );
};
export default ExampleContainer;

As you can see from this example, I have imported the css associated with this example, you don't have to include a css file but I am putting it here so you can see.

Next you will need a class and for ionic you will need the React.FC

This is very helpful if you need to build a new component from scratch.

I hope this helps you.