NEW TO C++ any suggestions

_hi i am Abhishek and i am new to this community before this i was a python programmer with not so great tools but i will learn eventually and now this is the code i have written from a 30 min tutorial _

include

int main() {

//this is used for comment 

std::cout<<"we must initalise the values of variable or other wise it will return garbage which is some random value ";

int dedication =100 ;
double posibility = 99.99 ;
std::cout<<"hi  there this is actualy just printing theme ";
std::cout<<dedication;
std::cout<<posibility ;

// this is the second section of the case 
//-----------------------------------------------------------------------------------------------

int const pi=3.14;
std::cout<<pi;

// this is naming conventions 
//-----------------------------------------------------------------------------------------------

int file_size=1; //this is snake case in 

//in this case the spce in a sentence is replaced by an underscore 

int FileSize=2; // PascaleCase

// in this case twowrds are wirtten together and the first letter is always capital 

int fileSize=3; //camelCase

// in this case the first letter of the first word is small and then the first letter of the second word is capital 

std::cout<<"the main thing is the code read the code and understand and the c++ thing the output is because i explained through coding itself ";

//MATHEMATICAL OPERATION 
//---------------------------------------------------------------------------------------------------------------

//addition
int a1 = 4;
int a2=5;
int a3= a1+ a2 ;        // because both a1 and a2 are intigers hence the a3 will also be intiger 
std::cout<<a3;

//substraction 
//intiger
int a4=6;
int a5=7;
int a6 = a5-a6;     // positive results
std::cout<< a6;

int a7= 1;
int a8= 2;
int a9=a7-a8;       //negitive results
std::cout<<a9;

//double
double a10=1.2;
double a11=2.3;
double a12=a11-a10;     //positive results
double a13=a10-a11;     //negitive results
std::cout<<a12;
std::cout<<a13;

//multiplication
//intiger
int a14 = 2;
int a15= 3 ;
int a16=a15*a14;        //positive results
std::cout<<a16;
int a17= -a15;
int a18=a17*a14;
std::cout<<a18;         //negitive results

// important
// if er devide an intiger with an intiger and the result is in decimal it will round off to the nearest digit

//double
double a19=1.00036456345364614663894363635365231351325132513315231231312231301;
double a20=2.0000000000000000000000000000000000002;
double a21=a20*a19;         //positive results
std::cout<<a21;
double a22=-a19;
double a23= a21*a22;
std::cout<<a23;

//division
//here also we can not devide by 0 
//we can devide by negitive number but the type must be same 
double a24 = 10.03;
double a25 = -10.3;
double a26 = a24/a25;
std::cout<< a26 ;

//modulas %
//prints remainder 
//avalable in both double and intiger form 
int a27=10% 3;
std::cout<<a27;

//improved way of example

//incriment and decrement 
//---------------------------------------------------------------------------------------------


//increment
// if we write ++ in front of a variable with a value then the value willbe increased by 1 
int a28 = -2;
int a29 = a28++;         //a28 will be -1 and a29 will be -2
int a32 = ++a28;        // a32 = -1
std::cout<<a32;       
std::cout<<a28;

//decreament
// if we write -- in front of an varible with an assighned value the the value will be decreased by 1 
int a30 = 0 ;
int a31 = a30--;        // a30 will be -1 and a31 will be 0
int a33 = --a30;
std::cout<<a33;         // a33 = -1
std::cout<<a30;

//order of mathematical operators 
//-----------------------------------------------------------------------------------------------------
//it will follow simple BODMAS rule 

// for example 
int x=10;
int y=5;
int z=(x+10)/(3*y);
std::cout<<z;

//using namespace and endl

using namespace std;

int x = 10 ;
int y = 20 ;
cout << "x=" << x << endl       //this will print x = 10 and y=20 in two different lines
     <<"y=" << y ;



return 0 ;

}