@dungblockchain, nice write-up you've got here.
This is very educative.
Thanks for sharing this beautiful article with us.

I can see that you are very new on steemit. You have not even done your introduction post to Steemit. There certain assignments you will go through as a newbie on steemit, not until you have gone through them and you get verified, you have not started getting things right.

Meanwhile i am @talktofaith from @steemalive community, we also have a mentorship whatsapp group where wd mentors newbies and help them shoot fast on steemit, i will love you to join our mentorship group for better help and mentorship.
If you are interested, contact me on whatsapp via +2348182654173
best regards from @talktofaith