How many parameters we should insert inside the IF function or formula to work probably? and can they be incremented somehow?

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NICE QUESTION 

ANSWER 

Three

Form

IF =(LOGICAL_TEST;VALUE_IF_TRUE;VALUE_IF_FALSE)

1-Logical test "condition "

2-Value if condition true

3- Value if condition false

example

a2=12

a3=17

a4=15

=if(a2<15:"good";"excellent")

Then 

*- they can be incremented conditions by using functions such " and & or "

example 

=if(and(a2<15;a3<15);"good";"excellent")

=if(or(a2>=15;a3>15);"have excellent";"do not have excellent")

*- they can be incremented  many conditions and many results by using  if function

example

=if(a2<15;"good";if(a2<17;"very good";"excellent"))

and you can make more complicated formulas

thanks for invitation