Along with many other people on this forum, I'm not an English teacher or a native speaker, and I don't live in a place where English is the main language. I'm going to share some information I learned by accident from books and websites.
I'm glad if any of this information helps someone.
1. Every day or Everyday?
Both are different!
I don’t want you to come here everyday. [Incorrect]
I see him everyday. [Incorrect]
Every day- Means, each day.