@congdoanh, a warm welcome to Steemit. This is a great community and I know you will have a great time here.

I want to invite you to join the discord channel #steemschools https://discord.gg/eTZqQvk and we will teach and support you to grow up in Steemit, to choose the right topic to attract readers, to use the right tags to get more visibility, how to make quality posts and comments on Steemit, etc.