HTML

• The head element contains information about the webpage.
• The body element represents the visible content shown to the user.
• Elements within the body or head elements are called child elements. The head and body elements are parent elements.
• Setting the viewport sets the user's visible area of a webpage and varies with the device.

CSS

• A margin indicates how much space we want around the outside of an element.
• A padding indicates how much space we want around the content inside an element.
• An external style sheet is the most common method of writing CSS code. It is preferred because it allows developers to keep all CSS Rules in a separate file.
• A link element within the HTML file creates the connection to the external CSS file.
• You can define colors by using semantic references, such as 'gray', or by its hexadecimal code, or hex #.

GIT

• git status: checks what branch we are currently on
• git checkout -b branch-name: creates a new branch and switches to it

JavaScript

• JavaScript coding makes web pages interactive.
• A variable is a named container that allows us to store data in our code.
• Control flow is the order in which a computer executes code in a script.
• An array is a structure that allows you to store multiple values in a single reference.