pls can you help explain what these methods do, pla reference the code?

public void insert(int data) { Node new_node = new Node(data); new_node.next = null; if (head == null) { head = new_node; } else { Node last = head; while (last.next != null) last = last.next; last.next = new_node; } } public void make_partition(int x){ Node list2 = head; Node curr = head; while(curr!=null){ Node next = curr.next; if(curr.data