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 @adil 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