What does english (native) and spanish (professional) mean under languages does native mean your first language or the language you learned

I studied Spanish in high school and then Filipino and Korean as an adult, but I just started studying Spanish again after discovering Duolingo and Chinese after discovering ChineseSkill (knock off version of Duolingo). Spanish, by far, has been the easiest language for me to pick up since my first language is English (I wish I tried harder to study Spanish in high school). I'm curious to know what languages have been easy for you to learn based on your native language.