Learnt when attaching an event listener on a form, you always attach it to the element and NOT to the button itself.
Learnt about using the ‘event object’ and what you can do with it
Prevent default 'refresh' behaviour of the submit event
Firefox devtools is better than Chrome here as it visually shows you when you have selected the field.
Get a reference to the username field and log it to the console. Clue - use the ID of the input field.
Regex basics. A regular expression (regex) is a matching pattern that only allows a certain combination or pattern of characters to be entered i.e. 4-18 characters and only containing letters and numbers
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