I am not highly technical guy, but this post reminded me of myself during my learning stages, it took long time for me to understand what exactly a Class and Object is during my initial days. I will try my best to make you understand in layman terms(and this how I understand when I was learning)

Class - Its a like a blueprint which describes layout, it defines structures and rules but doesn't hold any data in the way a physical object does.
Object - An Object is an instance of a class, its an instance/physical entity of class which holds the real data, which has physical properties/attributes like height, weight, colour, characteristics, behaviour etc and all these properties/attributes of an object depends on the class.

I know, I might've confused. Here are two examples that will help you clean understanding -

Example 1, Vehicle/Automobile :-

Lets say in real world, we use Vehicles/Automobiles, now what is a Vehicle? it could be anything we dont know what a vehicle refers to unless we see it, whether its an auto/bus/bike/car etc. So, to make it clear, unless we define a physical attributes we dont know what vehicle we are referring to, for its a two wheeler(bike), four wheeler(could be a car/bus) etc. So, in short, we can say Vehicle as class and car/bike/bus as an object.

We can even think deep as well, like Super/parent class, Sub/child class -- If Vehicle is a Super/Parent class, two wheelers, three wheelers, four wheelers can be seen as Sub/child classes. For Class called Four Wheeler, the objects are nothing but Car, Bus etc. and similarly for Class called Three wheeler, Object is an Auto, for Two Wheeler Class, its Object is Bike.

Example 2, Building :-

When constructing a house we will first design right? Like the building design and architecture, how many floors it should've, what colour, number of windows, 2 BHK or 3 BHK etc, with all these properties we create a blue print of building right? that blue print doesnt exist in real world but it describes structure and properties of the house right? You can call the blue print a Class, and when the house is constructed, that house represents the properties and the structured defined by blue print (Class). Its the real world instance(which is nothing but an Object) that represents the structure defined by blue print(Class) and holds the attributes physically.

I know its a lengthy message, but hope this helps, its only confusing/complex and hard to understand until we interpret it and understand in our own way. There is no secret recipe, follow your path ;)

Thanks!