A valid if-else statement requires the following:

• The if keyword at the beginning of the line 
• A pair of parentheses to hold the condition
• A statement body:

if(condition is true)
 Execute this line of code

However, if the statement body is more than a single line, it needs to have a pair of curly brackets to hold the bigger code block:

if(condition is true)
{
    Execute multiple lines
    of code 
}

Optionally, an else statement can be added to store the action you want to take when the if statement condition fails. The same rules apply for the else statement:

else 
    Execute single line of code

// OR

else 
{
    Execute multiple lines
    of code
}

In blueprint form, the syntax almost reads like a sentence:

if(condition is true)
{
    Execute this code
    block
}
else 
{
    Execute this code 
    block
}

Since these are great introductions to logical thinking, at least in programming, we'll break down the three different if-else variations in more detail...