Welcome to Steemit @joinynguyen. I also like to travel and have been to Hanoi a very years back. I enjoyed the ancient city and the water puppets. You will find that Steemit is very supportive. To help you start off, here are some tips.
https://steemit.com/steemit/@positivesteem/newbie-nuggets-how-i-create-killer-content-for-my-posts