Conference Imposter Syndrome

I just got done attending a two-day conference in another city related to a role I just started a month ago, and my God, I feel like my brain is total useless mush. I followed along with about 70% of it, but the rest was like everyone was speaking another language and I swear they all know things that I will never know and they all were more professional and put together and... competent. I have high confidence in my learning ability, but I feel like it goes beyond just being new at this stuff... it's like everyone has answers to questions and speaks eloquently and I am over here sounding like a frat bro. I swear I am a professional and I know some shit, but at the moment I feel like a complete moron. And now I get to go back to work and be two days behind there. Yaaaayyyyyyy