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Last concern, in my personal history. I started working 2017 august up until now but during these years i enrolled a vocational course from september 2019 and finished may 2021.
Please help me how to list these. Can i write
2021-05 to present as employed to ABC compny
2019-09 to 2021-05 education
2017-07 to 2019-09 employed TO ABC company?
 
I believe your months should not overlap. Ie I don't think it will validate if the months overlap.

And for each period, list your main activity. If eg you were working part time while studying full time, activity is education. You can add a short letter explaining eg part time work .