How many elf types are there?

Could you please elaborate on the diversity of elf types? I'm curious to know if there is a specific classification system for elves or if the number varies depending on cultural or fictional contexts. Is there a general consensus among folklore enthusiasts or mythologists regarding the various elf types? And if so, how many distinct elf categories are typically recognized? Additionally, are there any notable variations or subtypes within these main elf classifications? I'm particularly interested in hearing about the unique characteristics and traits that distinguish the different elf types.