[Solved]-Single React Component rendering with Babel Standalone with only index.html and Component-Reactjs

your code is fine, you are using a really old version of babel-standalone though.

// this
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.4.4/babel.min.js"></script>

// should be this
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.17.0/babel.min.js"></script>

and

<script type="text/babel" src="components.js"></script>

// should be
<script type="text/babel" src="components.js" data-presets="es2015,react"></script>