What have you learned here on Chess.com?

Oh yeah, Attention span.

Learned this from DC-poc today!

 cromulent :

(crôm-yü-lənt)

1. 1. (adj.) Being well-formed; legitimate; of a word, especially a neologism, that is not previously attested in the language but obeys its rules of word-formation.

   Origins: This word was originally coined in season 3 episode 13 of The Simpsons TV series back in 1996.

One more thing. For a while, I wondered, "Why are Goldendog, Reb and others shouting expletives on the forum?". HOS here, HOS there. Then I learned that HOS stands for House of Staunton.

420, 4:20 or 4/20 (pronounced four-twenty) refers to consumption of cannabis and, by extension, a way to identify oneself with cannabis subculture. The notable day for these is April 20. (Not to be confused with J-Day, an international protest held on the first Saturday of May.)

IANAL = "I am not a lawyer"

IJMTAU = "I just made this acronym up"

Sorry seems to be the hardest word.

 I learn here that there are troublemakers here that can possibly destroy someone reputation too easily. 

+1

And what trolls are

 What keeps somebody rated 975 from knowing what trolls are?

 So people rated 975 are stupid, and so far beneath you, they're not worth wasting your on?

Oh. I thought he meant don't waste time on him...my bad

I forgot to put the word "TIME" between "your", and "on" in my post.

Gambitking, I don't believe you.

Hang on, we already knew that... Gambitking's decent at chess - but from his forum posts...

I learned that very few threads here manage to stay on the original topic for very long

No you just post very strange posts.