Never invest in any company before you’ve done the homework on the company’s earnings prospects, financial condition, competitive position, plans for expansion, and so forth. 
PS: 
搞清楚你是在"投机"还是在"投资". 
你承担的风险取决于你的"认知". 
你赚不到你认知以外的钱. 
你某一天突然赚到的不明所以的钱, 在未来某一天也一定会亏回去.