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JavaScript basics

Add a note about the difference between var and let, because both options are mentioned without any comment.

What is JavaScript?

Adding a recommendation about comments to balance the previous high encouragement to write them.

What is JavaScript?

async and defer are useful for parallelism between fetching the script and parsing the page. With async, the script is evaluated as soon as it is available. With defer, the script is evaluated when the page has finished parsing.

HTML basics

Opening and closing quotation marks by default.

HTML: A good basis for accessibility

Adding the alternative for the value of the alt attribute to mark an image as a decorative one.