Lie = Some false asseveration.
We need to notice the difference between the pronunciation of both words and not confuse the spelling.
Examples with "lie":
[00:00:00] All was just a lie, I can't believe in anything. ✔️
[00:00:00] All was just a lay, I can't believe in anything. ❌
Examples with "lay":
[00:00:00] I'm going to lay down, I'm sleepy. ✔️
[00:00:00] I'm going to lie down, I'm sleepy. ❌