Did you expect you would have to give out an address? Some form of ID that involves letters? Spell something out on the phone?
No to all Were you worried about one letter being mistaken for another?
Among other things, yesDid you expect to have to spell every letter of the alphabet?
No Or only certain letters?
Yes, although I didn't know which ones Given the title, maybe the letters "R", "S", and "T"?
Not specifically, see previous answer* Did you only need to learn about certain letters because you alredey knew how to pronounce others?
YesDo you want to use the letters to name fields in a game (e.g. chessfields)? Grid squares? Use a classification system that involves letters (e.g. for a library)? Refer to sections of a text? In a mathemathical formula? Chemical formula? Program code? Do you expect to have to pronounce abbrevations?
No to all* The title has no particular connection to the puzzle. It's taken from this sea shanty that went viral on social media this week and that I can't get out of my head. If you clicked on the link, congratulations on your new earworm!