Which are the optimal temperatures for i7-6700 HQ CPU?

Hi dear community,

I would like to ask which are the optimal temperatures for i7-6700HQ CPU:

1.While the system is idle:

2.While the system is under high load

3.Which temps are dangerous

4.And which temperatures would be OPTIMAL while playing some heavy game like GTA V for 1 hour without break for an example?

And is downclocking of the CPU safe?Could it lower the CPU temperature?Also would the game lag if the CPU is downclocked?Also on which temperature this CPU starts throttling,and how can I test it to know if it is throttling?And which temperatures could short the CPU's lifespan?

Please answer to my questions!

Thanks in advance!

Best regards!