v1.1

1.  Delete redundant "Tips";
2.  Add neccesary illustration;
3. Unfinished all 1st part notes of the 3 languages.

Author: zhyd1997

README.md

@@ -4,13 +4,53 @@ The project is created to learning *Javascript* and *Python3*, but beginning wit
 *Text editor*：1. [Dev-C++](https://sourceforge.net/projects/orwelldevcpp/) 2. [Visual Studio Code](https://code.visualstudio.com/) 3. [Notepad ++](https://notepad-plus-plus.org/download/v7.5.3.html)   
 
 Also welcome to visit the [Programming_CN](https://github.com/007tom/Programming_CN)!
-## Ⅰ. Knowledge Point      
+## Ⅰ. Knowledge Point     
+
+	Attention: 
+		
+		1. All of the languages below is sensitive to case;
+		
+		2. ';' indicates that the end of a sentence;
+		
+		3. Please indent with "Tab" key or 4 keyboard instead;
+	
 ### 1. *C++*
+
+	Tip:
+
+		Attention to priority of opertators.
+		
+#### 1.1 The meaning of program design:
+
+```
+	#include <iostream>  // include library functions
+	using namespace std; // namespace 
+	/* the main function */
+	int main() {
+	
+		return 0;
+	}
+```
+
 ### 2. *Javascript*
+
+#### 2.1 Data Type:
+(1) Number:
+
++ no distinction between int and float;
++ *NaN*, standing for '*Not a Number*', is used when sentences can not be computed! 
++ *Infinity* represents much great number, when used in case that the number exceed maximum!
+```
+	0 / 0; // NaN
+	2 / 0; // Infinity
+```
+
+(2) String:
+
+(3) Boolean: true false
+
 ### 3. *Python3*   
-#### Tips:
-##### 1. Make sure that *Tab = 4 Backspace*.
-##### 2. Python program is *sensitive* to case.
+
 ## Ⅱ. Demos
 ### 1/33. Shopping
   Description: