Just do a quick google to find out what it's equivalent value is in your fiat currency (cash). Bitcoin is worth about 8k usd right now. You can use them for numerous things but it's limited because most places do not have the technology to accept and there is the legal issue with your government. And yes you can convert it to cash. There are bitcoin atms around.... speaking specifically for america though. So check your area out first. The atms have a fee to convert it to cash though so be aware.