You're

>! SWIFT! :D



how do i do those yellow boxes? Nvm got it.

You are
>! SWIFT

I am the first.
>! swift is speedy

I am in apple.
>! devices i'm in.

I am a language.
>! ya programming language 

I am there in above lines, of course here also.
>! first apple language

Beginners prefer me.
>! SWIFT for noobs