How to show a link association between two classes?

Question

C++ / C#

Good day everyone. I have a difficulty in drawing up a class diagram, namely understanding and applying the association relationship, please help. Here is an example:
There is class 1 and class 2, class 2 works with 3 fields and a function of class 1. This is a connection and there is an association, and if so, then I need to draw 4 arrows from class 2 to class 1 while indicating that to what does it apply to?
There will be questions on the example, ask.

Answer 1

Class diagram. UML