I dont understand what "->" is.

-> is how you set a class variable from outside the class and call the function from outside the class also. Then you use it inside the class to set variables as well as part of the constructor function.

Consider this code:

<?php

class Fish {
 Public $common_name;
Public $flavor;
Public $record_weight;

   function __construct($name,$flavor,$record){
    $this-> common_name=$name;
    $this-> flavor=$flavor;
    $this-> record_weight=$record;
  }

    Public function getInfo(){
      return "A" .  $this->common_name .  "is an" . $this->flavor . "flavored fish.The world record weight is" . $this->record_weight; //used record_weight and added concatenation
  }
}

$bass = new Fish('Largemouth Bass','Excellent','22 pounds 5 ounces');

?>

A class fish is defined and includes variable definitions, a constructor function to accept input and assign it to class variables.

$bass creates a new instance of the Fish class. We could also create a new $tuna, new $sword_fish, and new $sturgeon at the same if we wanted. Each one would allow the class to function.

$this is a special word that has several different meanings. In this context it is assigning the variable for each instance. So $flavor means different things for each instance of the class.

If we wanted to echo the getInfo() method for $bass, we would use:

<?php
echo $bass->getInfo();

Take the course again if you need to. I have watched several of the videos 4 or 5 times and am not 100% sure I can implement it on my own. I am currently working on a project that uses OOP for database work. it is really stretching my knowledge and building my understanding.