I learned to trade by self research using google and youtube. Then I came across this forum which is a great place for crypto enthusiasts. So I suggest you do the same.

As far as I know the transference of Bitcoin or any other crytocurrency is prohibited in Bangladesh. As payoneer is supported in bangladesh complying with all the rules and restrictions of the country, I do not think it is possible to convert Bitcoin to FIAT currencies in Bangladesh.

With the huge amount of data associated with airliners, it is mandatory to deploy tool that is large in scalability. Blockchain is the solution truly. With these data making avialable to third party platform, numerous services would actually be avialable for people. Air Canada is thinking one step ahed in the business.