Sharing some random tidbits I learned throughout the week.

• On a Macbook, can show desktop by using fn + F11 or by spreading 3 fingers and thumb on the trackpad.
• Notification centre can be accessed by swiping with 2 fingers from the right to the left on the trackpad.
  • Can see useful information like calendar events, stocks and weather.
• brew install tree to get the tree command which lets you view the contents of directories in a tree like format.
• When using a PC keyboard on a Mac, the windows key is the command key. However, you can set your modifier keys like this to make it feel like the mac keybaord.

• There are 250 days in a trading year.
• ActiveRecord::Transactions can be used to ensure that blocks of SQL statements are only permanent if they can all succeed as one atomic action. Otherwise, they are rolled back.
• Arcade games in movie theatres are rigged so that you can only win once in x many games.
  • x is a setting that can be adjusted.
  • Usually proportional to the value of the prizes.
• Writing An Option refers to the act of selling an option.
• Option traders don’t just “buy” or “sell” like they do with stocks.
  • Buy to Open: Purchasing an option to enter a long position.
  • Sell to Close: Sell your option to close your existing long position opened through a buy to open order.
  • Sell to Open: Open a position on an options contract by short selling it.
  • Buy to Close: Purchasing an option to close a previously opened position rather than to open a new one. Second part of Sell to Open.