if statement with floats in C# . what did i do wrong ?

define "wrong".

it'll execute more than it should because you're checking for less than or equal to zero when just less than is enough. otherwise it's doing what you told it to.

wrong is also posting a screenshot ins$$anonymous$$d of the actual code - it's easier for us to help you if you post the relevant part of the script. (don't forget to use code tags - the faq/tutorial video will help explain things).

it doesn't execute the code that's inside the {} while the statement is true that's what's wrong .

but it's getting to Update()?

There isn't anything wrong with your if statement. Try adding some debugging statements that you can read in the console:

 //... previous code
 void Update() {
   HealthBarScale -= 0.005f;
     
     Debug.Log(string.Format("In PlayerInfo Update method, Current Value of HealthBarScale: {0}", HealthBarScale));
     if (HealthBarScale <= 0.00f)
     {
         Debug.Log(string.Format("HealthBarScale is less than or equal to 0.00, its current value is: {0}, forcing 0.00f as HealthBarScale value.", HealthBarScale));
         HealthBarScale = 0.00f;
     }
     else
     {
         Debug.Log(string.Format("HealthBarScale is greater than 0.00, its current value is: {0}, no changes to variable at this time.", HealthBarScale));
     }
     
     healthBar.localScale = new Vector3(HealthBarScale, 0, 0);
 }

You should also look into using $$anonymous$$athf.Clamp to clamp the value to 0.

Also if you HealthBarScale -= 0.005f; in every update() it ll be 0 form the first 2 frames... and it will go - really fast;