The concept of modularity is like building blocks. Each block (or module) can be put in or taken out from a bigger project. Each module has its own separate function that is interchangeable with other modules.
Newbie: Every single part of your system, program, or design is important. What makes working on it easier is by using modular designs. As stated in the card, it allows you to swap parts and be more creative with how you implement. Have modular design is like putting together a puzzle that has every piece fitting the next. You can make the puzzle look however you want!