everyday / every day

everyday : 毎日の、日常の、普段の　[形] dailyと言いかえ可能
every day : 毎日　[副詞]

e.g.

I want to learn everyday.
I go to work every day.

Reference source

https://hapaeikaiwa.com/blog/2013/08/15/%E3%80%8Ceveryday%E3%80%8D%E3%81%A8%E3%80%8Cevery-day%E3%80%8D%E3%81%AE%E9%81%95%E3%81%84/