Help!

Question

I am very confused. Why do I add “main” and what is “println”

Answer 1

Main is the start point of a program in many languages.

println is a function used to print text on the screen.

If it feels too confusing you can try a simpler language, such as Python, where Java's:
class MyClass {
public static void main(String[ ] args) {
System.out.println("Hello world!");
}
}

gets replaced to Python's:
print("Hello world!")