Welcome to steemit @maobi! This is a platform where you can write, interact with people and be part of different initiatives, projects and contests. To get a better understanding of how the platform works, it is recommended that new users take part in the newcomers' community achievement program. I will leave you a link in which you can review the teaching material for each achievement and the requirements needed to complete it.
Lists of Achievement Tasks, Resources & Materials : Newcomers Resources
If you are interested in cryptocurrency topics, you can join the Crypto academy and start with the introductory courses they are offering:
The Beginners Level Introductory Courses
You can opt for the 30 SP delegation program for newcomers.
If you need help, just let me know and I will do my best to clear your doubts.
Have a great day!