Hi Zulfikar, welcome to Steemit. You sound very athletic and fit, it must be nice to be healthy and play with your sons.
What subjects do you teach?
I think you must be one of the first people from Indonesia here, good for you.
Please lookat posts to get a bearing on posting.
I will follow you out of interest.
https://steemit.com/steem/@adil/yes-complete-guide-on-steemit-4-0
best of wishes
RE: Introduction myself