Statements in C falls into 3 categories:

[ Selection - Iteration - Jump] 

Selection statement:

here we choose one path from multiple paths ex (if ...else if , switch)

Iteration statement:

here we loop on a block of code until the condition be false.

ex (for , while , do...while)

While , for 

the control expression is executed before the body block

do ... while 

the body is executed for the first time then the control expression.

for loop is equivalent to the while  as you see 

for(expression1 ; expression2 ; expression3 ) 

where:

expression1 : initialization 

expression2: control 

expression3: update 

for while 

expression1;

while(expression2)

{

statements ;

expression3 ;

}

to exit from loop there is two ways:

1. the condition is false.

2. use unconditional statement.

Jump statement or unconditional jump statement:

ex (goto, break, continue)

Normal statement:

that we perform a normal operation like declaration or definition or calculation ....etc

Important definition of (Null statment) : 

Null statement is the statement that does not have any side effect or does not take any action.

ex : x + y ;