整理一下：
1.建议免费期后再开通，免费期内开通免费期到期后会删机。
2.处理器： 总共4个OCPU，内存： 总共24 GB，再往大调可能面临收费。
3.建议使用ubuntu系统时，不要选minimal。
4.目前美西圣何塞无法使用，具体原因未知。
5.具体的免费内容文档里有清楚的标明https://docs.oracle.com/en-us/iaas/Content/FreeTier/freetier_topic-Always_Free_Resources.htm#resources
其他注意事项欢迎吊大的继续补充。
BY wulabing的杂谈blog
n the U.S. people generally use Bitcoin as an alternative investment, helping diversify a portfolio apart from stocks and bonds. You can also use Bitcoin to make purchases, but the number of vendors that accept the cryptocurrency is still limited. Big companies that accept Bitcoin include Overstock, AT&T and Twitch. You may also find that some small local retailers or certain websites take Bitcoin, but you’ll have to do some digging. That said, PayPal has announced that it will enable cryptocurrency as a funding source for purchases this year, financing purchases by automatically converting crypto holdings to fiat currency for users. “They have 346 million users and they’re connected to 26 million merchants,” says Spencer Montgomery, founder of Uinta Crypto Consulting. “It’s huge.”
Secret Chats are one of the service’s additional security features; it allows messages to be sent with client-to-client encryption. This setup means that, unlike regular messages, these secret messages can only be accessed from the device’s that initiated and accepted the chat. Additionally, Telegram notes that secret chats leave no trace on the company’s services and offer a self-destruct timer.
wulabing的杂谈blog from id