app.js

import React, { Component } from 'react';
import {
  BrowserRouter as Router,
  Route,
  Switch
} from 'react-router-dom';

import './App.css';
import LandingPage from './LandingPage/LandingPage';
import PortfolioPage from './PortfolioPage/PortfolioPage';
import NotFoundPage from './ErrorPage/NotFoundPage/NotFoundPage';

class App extends Component {

  render() {
    return (
      <Router>
        <div>
          <Switch>
            <Route exact path="/" component={LandingPage} />
            <Route path="/portfolio" component={PortfolioPage} />
            <Route component={NotFoundPage} />
          </Switch>
        </div>
      </Router>
    );
  }
}

export default App;