The three different ways to add Scripts as follows
1. Inside <BODY> section: Scripts can be placed inside the <BODY> section.
2. Inside <HEAD> section: Scripts can be placed inside the <HEAD> section. This method is widely accepted method
3. External (another) JavaScript file
We can write scripts in a le and save it as a separate le with the extension .js. The advantage is that this le can be used across multiple HTML les and can be enhance the speed of page loading.