Update README.md

Author: MarcoZeee

README.md

@@ -134,17 +134,30 @@ Node.js runs in a single process and the application code runs in a single threa
 
 ## Q. ***What are the data types in Node.js?***
 
+Just like JS, there are two categories of data types in Node: Primitives and Objects.
+
 *Primitive Types*
 
 * String
 * Number
+* Bigint
 * Boolean
 * Undefined
 * Null
-* RegExp
+* Symbol
 
 * `Buffer`: Node.js includes an additional data type called Buffer (not available in browser\'s JavaScript). Buffer is mainly used to store binary data, while reading from a file or receiving packets over the network.
 
+*Objects* 
+
+* Function
+
+* Array
+
+* other regular objects
+
+
+
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