Ok so I´m assuming te didn´t watch Season 1, so te basics are:
*Serena came back from boarding school and her best friend Blair Waldorf didn´t receive her too well because Serena left without any notice not even to Blair. Serena came back because his little brother Eric tried to commit suicide.
*Serena meet Dan and instantly hit it off after their first date, Dan had a huge crush on Serena so his dream was finally true.
*Blair found out that Srena had sex with her boyfriend Nate bfore leaving to boarding school.
*Blair, Nate, serena, Chuck and Dan end up togeteher in a brunch where Blair and Chuck (don´t remmber too well who did it) tell Dan that S slept with Nate.
*Rufus and Lily meet again and we discover that they used to be acouple way back then.
*Nate thought at first that he had feelings for Serena.
+Nate and Blair broke up and 30 minuti later o so Blair lsot her virginity to Chuck (Nate´s best friend)
*Nate tried to rekindle things with Blair because his dad waas pushing him to do so.
*Serena and Dan finally become a couple after another data and then they discover that their parents used to be together.
*Dan´s and Jenny´s parents were separated but then their mothr Alison came back and rekindled things with Rufus but then separated again.
*rUFUS AND liLy tried to rekindle their relationship but lily left Rufus because Serena asked her to do it because sh was seeing dan and thought it would be too weird.
*Nate tries to get back together with Blair after realizing that he loves her but then he finds out that Chuck slept with her so thsi causes Nate to hate Chuck and Blair.
*Dan has issues with Serena´s grandma Cecee
*Georgina Sparks appear and it is revealed that she knows a secret of Serena. she tells Serena and Lily that Eric is gay.
*Serena and dan get away form each othr beacause of that secret and Georgina fools Dan and introduces to him as Sarah, this to gt back at Serena.
*Serena tells Dan she slept with othr guy because she´d rather tell him this than reveal hr secret, which is that she "supposedly" killed a guy.
+ Georgina and Dan kiss.
*lilly is engaged to bart basso (Chuck´s dad) They get married, Dan and Serena break up, Blair and Chuck get together but then he realizes that he´s a womanizer and always wil be one, so he leaves her.
*Nate starts a relationship with Vanessa (Dan´s best friend)
*Oohh and many things happen with jenny but it´s tooo long...
I surely missed details, maybe others can catch te up...:D
