Unity(C#) - How to move an object?

Question

C++ / C#

It is necessary to make an infinite cycle of moving the object: From the starting position to a certain distance to the right, after passing this distance, turn around and go this distance (return to the starting position) + distance to the left, and so on endlessly. I read the documentation on transform.position, but I couldn't implement it. It is advisable to provide code examples, thanks in advance for your help.
PS I am new to programming

Answer 1

In outline:

void Update()
{
transform.position+=Vector3.left*Mathf.sin(Time.time);
}