If you don't know when you should use pointers just don't use them.
It will become apparent when you need to use them, every situation is different. It is not easy to sum up concisely when they should be used. Do not get into the habit of 'always using pointers for objects', that is certainly bad advice.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…