full forms

https://support.chess.com/customer/en/portal/articles/1444932-does-chess-com-offer-benefits-for-elite-or-titled-players-

GM - Grandmaster

WGM - Woman Grandmaster

IM - International Master

WIM - Woman International Master

FM - FIDE Master

NM - National Master

CM - FIDE Candidate Master

What is BM? Samay Raina is a BM

That's not a real title and the title listed in that account was done as a joke, from what I understand. BM means Blunder Master though.

WFM- Womans Fide Master

page not found ?
https://support.chess.com/article/661-does-chesscom-offer-benefits-for-elite-or-titled-players

Over three years ago the link was correct

If you Check in Chrome, it says BM is Blunder Master but in microsoft edge it shows bad manners in chess

what are the best counters to the caro kann

You can ask this in the Opening section of the forums.

Why don't we use Google for this stuff?

i don't think you should be a be BM in my opoin

Baby Master, it means, Samay Rains's both parents have chess titles. Thats why BM Samay Raina.

By the way, on lichess, LM means life master

That's a USCF (United States Chess Federation) title though, not a FIDE title.