The NYC-transit module is a tool that tells you when your next train or bus is arriving. You can add the station you wish to receive information about, and you can set whether you want uptown, downtown, or both. You can also change the frequency at which the module updates its information. 

The 3-Day weather module does exactly as it says; it displays the weather over the course of the next 3 days. You can update the module with the coordinates of your general location, in order to tell the weather in that area. 

The Weather-Now module works in coordination with the 3Day weather module. This module alerts you of the current weather forecast, versus a future forecast. This module also requires you to upload the coordinates of your general location. 

My last module is the WeatherDependentClothes. Depending on the weather(as the name suggests), this module will inform you of what type of clothes to wear using little icons.

All of these modules require data from other sources, such as the MTA API for the information on train/bus schedules, and different weather APIs to supply information about the forecasts. These APIs effectively translate and digest raw data and send it out to people who request that data. The new data that is easier for the programs to comprehend and display in their own way.

An issue that I ran to was that whenever I rebooted the raspberry pi, its IP address would change, and the MagicMirror software required you to have the IP address up to date, so I would have to manually update the IP every time the raspberry pi was rebooted. In order to work around this, I set the raspberry pi to a static IP, which allowed the IP of the pi to remain consistent. With this static IP, I no longer need to constantly update the IP for the software, since now the IP is always constant.