It is based on the number of days you stay in India during the financial year. Generally, staying less than 182 days makes you an NRI.

Resident but Not Ordinarily Resident (RNOR) is a transition status where you are a resident in India but your foreign income is still not taxable in India for up to 3 years.

If an Indian citizen/PIO has Indian income > ₹15 Lakh, they become a Resident if they stay in India for 120 days or more (instead of 182 days) and 365 days in the past 4 years.

No, for an NRI, only income earned or received in India (like rent or interest) is taxable. Global income earned abroad is exempt from Indian tax.

No, NRIs are exempt from the mandatory Aadhaar-PAN linking. You can file your ITR using only your PAN card.