How to pronounce the letter "H"

For English speakers anyways...
https://theweek.com/culture-life/tv-radio/aitch-or-haitch-the-linguisitic-debate-that-matters-a-lot
APRIL 15, 2024
The host of "University Challenge", Amol Rajan,
is to change the way he pronounces the letter
"H" after complaints from viewers that he was
doing it incorrectly during his first series
presenting the BBC quiz.
Rajan found himself at the centre of a
linguistic storm when he was criticised by
viewers for saying "haitch" rather than "aitch",
an approach described as "horrible with a capital
aitch" on social media and "truly awful" in a
newspaper letters page.
...