First step would be to identify the tax return form applicable for an individual taxpayer
ITR 1 (SAHAJ)
For Individuals being a Resident (other than Not Ordinarily Resident) having Total Income upto Rs.50
lakhs, having Income from Salaries, One House Property, Other Sources (Interest etc.), and
Agricultural Income upto Rs.5 thousand
(Not for an Individual who is either Director in a company or has invested in Unlisted Equity Shares)
Instructions for filling ITR-1 SAHAJ
click here
https://www.incometaxindiaefiling.gov.in/eFiling/Portal/StaticPDF/Instructions_ITR_1_AY_2019-20.pdf
ITR 2
For Individuals and HUFs not having income from profits and gains of business or profession
ITR 3
For individuals and HUFs having income from profits and gains of business or profession
ITR 4 (SUGAM)
For Individuals, HUFs and Firms (other than LLP) being a Resident having Total Income upto Rs.50
lakhs and having income from Business and Profession which is computed under sections 44AD,
44ADA or 44AE
(Not for an Individual who is either Director in a company or has invested in Unlisted Equity Shares)
Instructions for filling ITR-4 SUGAM
click here
https://www.incometaxindiaefiling.gov.in/eFiling/Portal/StaticPDF/Instructions_ITR_4_AY_2019-20.pdf