What is the definition of beginners


There is no official level. Ratings only make sense in context of the place they were earned. So, for example, a FIDE over the board rating starts at 1000. Many players do not achieve that rating. They are not all beginners.
New members always started here at 1200.
Many were already experienced players.
Most beginners found their ratings falling well below that 1200 level. Some have tested the depths- deliberately driving their ratings down to the 100 level.
If you look at the distribution of blitz ratings, it seems likely that the beginners fall below 500.

Oh, thanks you, I know how to play chess for several years yet still know little about it, I always thought 1000 or 1200 are beginners level haha

Oh, thanks you, I know how to play chess for several years yet still know little about it, I always thought 1000 or 1200 are beginners level haha

Oh, thanks you, I know how to play chess for several years yet still know little about it, I always thought 1000 or 1200 are beginners level haha

In my opinion, for chess.com blitz ratings, it's something like:
Novice = 0-600
Beginner = 600-1200
Intermediate = 1200-1800
Advanced = 1800-2100
Expert = 2100-2400
Master = 2400-2700
Grandmaster = 2700+
But for FIDE ratings, it's lower than that. Online ratings are more inflated than real life ratings.

Beginners don't HAVE ratings! A new Beginner has never played a single game of chess, much less a rated national or international game. Beginners first learn the rules of the game, play as many casual games as possible and then (some players) start to think about playing rated games. You start with the minimum rating which is awarded in exchange for sending your name and membership fee, e.g. USCF 100 which has the assumption that you are breathing. Chess.com should take its first ratings for a player as their national (USCF, BCF, etc) or international (FIDE) ratings, not this ridiculous and lazy practice of making everyone 1200.

OK, "lazy" is perhaps unfair. It is a lot of work to verify a new player's claimed rating. But if you are an established 2000+ player (USCF/FIDE), you play 20+ games here and win all but one because of e.g. a mouseslip or a cheating opponent, then your new, non-provisional rating is a kind of hole that is difficult to dig out of, i.e. you now need to win many more games to get to your appropriate level.