Noob is someone who is new and has no hope

Newb is someone new who is trying to learn

I just googled it for ya. 😀

Different spellings can have quite different connotations; so in some contexts a "newb" refers to a beginner who is willing to learn, while a "noob" refers disparagingly to an inexperienced or under-talented hacker or gamer who lacks the determination to learn.