You don’t even need to say that. My three lines I’ve used for every job are: The resignation letter simply reads: “Effective today’s date I hereby notify my em

You don’t even need to say that. My three lines I’ve used for every job are: The resignation letter simply reads: “Effective today’s date I hereby notify my employer of my intent to resign my position of position on date two weeks from today”. Signed and dated with nothing else. If asked why, the answer is “I’ve decided to seek opportunities elsewhere”. If asked where, the answer is “I’d rather not say at this time”. As you say, there’s almost no benefits and only drawbacks to divulging any other information than that in most cases.