add running-javascript

Author: geekysrm

running-javascript.md

@@ -0,0 +1,19 @@
+## Running JavaScript:
+
+- We can run JS on the browser's console by which we will have access to the page we are on.
+
+- Also we can run it in a `script` tag:
+
+```javascript
+<script>console.log('Heyyy');</script>
+```
+
+Always try to have your `script` tag before the closing `body` tag, because we can access the HTML elements written above the `script` tag as they are above the JS.
+
+- Also, we can run JS in another file using `script` tag with `src` attribute:
+
+```javascript
+<script src="relative path to js file"></script>
+```
+
+- Also we can run it via Node.js - instead of running in the context of a website we run it in an actual machine. In console, run: `node file.js`