Types of data
There are four essential data types that I would like to introduce to you. Those data types, in computer science, are often called Primitives or Primitive data types. The following screenshot shows String, Integer, Booleans, and Double data types:
Strings literally represent text data. As you can see in the top left of the previous image, strings can contain numbers, but unlike integers or doubles, the numbers are read as characters. You can identify strings by the opening and closing quotes at the beginning and the end of them. For example, "1" + "1" will be equal to "11", and not 2, as you may expect. Using the plus symbol between strings means concatenating this string with the next one, not summing their values, even if those strings include numbers such as "2" or "554". For computers, they are strings, not numbers, so if we sum "1...