There is no one answer for those that covers prompting in general.
One of the biggest changes for GPT 5.5:
@VeitB noted this on the forum, and you will have to search for it.
If you go back to the GPT-3 era, asking for chain-of-thought reasoning was common and often recommended.
However, with modern reasoning models that use internal reasoning or thinking tokens, explicitly asking for chain of thought is generally ill-advised.
OpenAI has an app or web page where you can submit a prompt and it will improve the prompt, I can not find it at the moment.
While this is for the API, it is of value to read.
The reason I am not going into more detail is that this is a long, deep, and complex rabbit-hole question.
Prompting is a large topic on its own. I have not checked, but I would not be surprised if someone could get a Ph.D. for it.