JavaScript is the bridge between static content and user action. Your first steps involve learning how to 'inject' your logic into the HTML document and verify its execution.
1The Injection Protocol
JavaScript is brought to life via the <script> tag. This tag acts as a portal: everything inside it is treated as logic rather than content. You can write your code 'inline' between the tags, or link to an external file using the src attribute. Placing scripts at the end of the <body> is a common performance pattern that ensures the page loads before the logic begins.
2The Feedback Loop
As a developer, you need to see what your code is doing. While alert() is useful for beginners, it is 'blocking'—it stops everything until the user clicks OK. Modern developers use console.log() to send silent messages to the Developer Tools Console. This 'feedback loop' is the most critical part of your daily workflow as a software engineer.
