You can read and learn about ICO here

https://www.cbinsights.com/reports/CB-Insights_Future-Blockchain-Briefing.pdf?utm_campaign=blockchain_2018-05&utm_medium=email&_hsenc=p2ANqtz--kxAdlo1seRlVBpTdCHaxSi-gyRV-kHOn5hOLOb4Vwv-VbVSyNb3uZtaZt1FzdMN8MtgBfXckMpmqNXaGncnB4yMvmlQ&_hsmi=62769514&utm_content=62769514&utm_source=hs_automation&hsCtaTracking=889cdbf2-c51a-4d48-83c0-c5784d5807bb%7C483f37ce-29b0-4b5c-8eb4-e8f7547c095c