So after the first 3 zeroes, it's a comma every second zero. And there are local names for those denominations.
So
10
100
1,000
10,000
1,00,000 = 1 Lakh or 1 Lac
10,00,000 = 10 Lakhs/Lacs
1,00,00,000 = 1 Crore
People generally don't use the next set of names which are called 1 Arab and then 1 Kharab and probably a few more, they just start saying 1000 crores or lakhs of crore etc.
Many people also use millions and billions instead of the above.
And then decimals are denoted by a period, not commas.
Kind of related, our financial year is from 1st April till 31st March, so you gotta watch out for quarter numbers not matching. Our financial Q1 is the calendar Q2...
With one medieval weapon allowed each