Anyone talks about one person or one person in a group. It is not important which person. Everyone talks about all the members in a group.
- I didn’t see anyone this morning.
- Does anyone know his name?
- Don’t worry, everyone here will get a ticket.
- Everyone is welcome to my funeral.
The same is when talking about things.
Anything talks about one thing or one thing in a group. It is not important which thing. Everything talks about all the things in a group.
- Is there anything we have forgotten?
- The package contains everything you need to build the wardrobe.
Common mistakes with pronouns.