美股入门：选股
- 平衡风险，多样性和回报
- Sharpe ratio: 测量风险
投资回报与多冒风险的比例，这个比例越高，投资组合越佳。举例而言，假如国债的回报是3%，而你的投资组合预期回报是15%，你的投资组合的标准偏差是6%，那么用15%－3%,可以得出12%（代表超出无风险投资的回报），再用12%/6%=2，代表投资者风险每增长1%，换来的是2%的多余收益。
- 买自己了解的股票：从已知的行业知识，日常生活中的观察，帮自己选择股票
ps: ETF can be “ETF”, “ETN”, and “Closed-Ended Funds” ; Volume represents popularity
- 常用的分析和数据网站：
- MNS news: 类似数据大超市，需要自己筛选
- The Motley Fool : 报道写的更有意思
- Cramer：报道写的更有意思
- Motley Fool: 一个挑选股票的网站
- Discount Broker: robinbhood (只能美国公民)， Degiro，interactive
- 虚拟交易，模拟交易平台：howthemarketworks.com, Virtual-Stock-Exchange, or StockTrak.
公司的价值可以看净资产，净资产即公司的所有者权益，由总资产减去负债构成。市值与净资产的比值（市净率）越小，则说明公司相对泡沫较小，反之则相对泡沫太大。
股票rules：
1，及时止损，保留优势股票
及时止损，因为跌的百分比和张的百分比不一样
保留winner股票：Buy and hold
let’s say you bought Google (GOOG) in 2004 at $100 per share. If the stock is trading now at $400/share, every 1 percent rise in the stock produces for you a 4 percent gain. Not bad, eh? That’s how you get rich: finding winners and sticking with them as long as they keep rising consistently.
2，不要和股票有感情
大部分人后悔没及时卖掉，以为到了谷底
3， Never lose more than 10%
your goal is about growing your wealth, not taking a gamble.
Stop orders, particularly trailing stop orders, should be set as soon as you buy every stock.
4， diversify
Generally speaking, you should try to have at least 10 stocks in your portfolio and those stocks should be from at least 5 different industries.
5，volume
考虑交易量，价格，尖峰的关系，判断当前的行情：信心？新闻？做空？多方角逐？
6， Have an Exit Plan and Target for Every Stock
stop/till order
