Should we always use dot notation?

I thought that we had to add () when referencing an object? In the previous question I chose person1.age but i thought it would be person1.age() ?

Do we never delete data in an JavaScript Object? Does the array methods like pop and shift works when removing data in objects as well?

I am confused about the syntax of using object.keys for unknown properties and where each part of the syntax comes from.

I would like to talk more about Unknown Properties.

The reading is straightforward. Since JavaScript is similar to Java I'm able to understand the syntax! / the reading made sense