HTML

• The head element contains information about the webpage.
• The body element represents the visible content shown to the user.
• Elements that are nested inside other elements are called children elements.
• Semantic HTML elements are those that describe its content and the role it plays on a webpage.

CSS

• A margin indicates how much space we want outside of an element.
• A padding indicates how much space we want around the content inside an element.
• There are three ways to style CSS: inline CSS, internal CSS style sheet, and external CSS style sheet.
• External CSS style sheet is the most common and preferred method as it allows developers to keep all the CSS rules in a separate file.

Git

• Git status: checks what branch we are currently on
• Git checkout -b branch-name: creates a new branch and switches to it
• Git add -A: to add the starter code to the current working branch
• Git pull origin main: this command is to receive a branch's modifications in the local environment
• Git push origin: push the changes we have locally to our GitHub branch

Javascript

• 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.
• An array is a single variable that is used to hold a group of data.
• Arrays can contain more than one type of data: strings, numbers, etc.
• In order to work with individual items in an array we need an index, which is a unique number that identifies the location of the data item in the array.
• Index always start at 0.