Warren Buffett warned newbie investors, touted tech stocks, and dashed acquisition hopes at Berkshire Hathaway's annual meeting. Here are the 7 key takeaways.

Warren Buffett cautioned new stock-pickers that investing isn't a cakewalk. The Berkshire Hathaway CEO said he was probably wrong to trim Apple and sell Costco. Here are the 7 key takeaways from Berkshire's annual meeting this year. See more stories on Insider's business page. Warren Buffett cautioned newbie investors not...