*** print() ***

First, I have learned the command print. The command print is a function, print(). It should be used with parentheses. 
Case also matters. It should be in lowercase as most Python commands are in lowercase.

print("Hello, world!")

Hello, world!

As you can see anything inside quotes will be printed onto the screen exactly as it appears. You can type anything inside 
quotes: letters, numbers or characters.

print(" I have 3 pencils... ")

 I have 3 pencils... 

Print("Got an error message because case matters.")

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[4], line 1
----> 1 Print("Got an error message because case matters.")

NameError: name 'Print' is not defined

We can use the command print() without quotes, too. 

print(2)

2

The command print() just returns that number when we do not use quotes around the number.

print(2*3+5)

11

It returns the result of the arithmetic expression. If we use parentheses around the expression, it will return the expression
exactly as it is.

print("2*3+5")

2*3+5

Anything inside quotes is called a string that is a combination of letters, numbers and characters. Below are some more 
examples:

print("Enter a number: ")
print(9/5-2*3+4)
print("9/5-2*3+4")

Enter a number: 
-0.20000000000000018
9/5-2*3+4