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1. It is better to have the JavaScript tags at the end of the body tag than in the head tag to avoid delays in the page load.

2. we should always use === and !== instead of == and != in JavaScript.
The == operator will compare for equality after doing any necessary type conversions.
3 == "3"  // true
3 === "3" // false
See this link for more details: http://appendto.com/2016/02/vs-javascript-abstract-vs-strict-equality/