How to learn to determine what is an operand and what is a literal, and are they the same in all languages?

Question

Programming

As I understood from google and other answers, a literal is a literal representation of an object, i.e. a literal is an object first and foremost and is stored in memory. And the operand is what the operation is applied to.

And I imagine for myself that literals are some part, for example, if you write String [] array = {1,2,3};
then here String is a type, [] is an array object literal, array is a variable name consisting of ascii characters, = is an assignment operator, {} are two object literals, 1, 2, 3 is an operand and at the same time a number literal.
But in this example:
array[1] - array is already an operand and 1 is also an operand, and [] is an operation.
And signs like , . ""''\|{}; do they have a generic name?

And if we take this example class Person{ String name;
Here class is a keyword, Person is the name of the object, {String name; int age} - object literal, name and age - variable names, String, int - type, { } - literal.

But what if there are just abcde characters in the code that seem to be not a string, since they are not wrapped in quotes, or < > - + = operators, while they are presented in the development environment? Just a set of ascii characters? And are they stored in memory?

Answer 1

why define?
i.e. in general? what will this knowledge give?
Plus, it works differently for different languages.

Answer 2

A literal is the value of a variable explicitly written in the code, i.e.

x = 1
obj = { a: "1"}

1and are literals. The operand is what the operation is applied to, i.e. is an addition operation, and are operands, moreover , it is also a literal at the same time. { a: "1"}
y = x + 1
+x11