Yes, deducting TDS and filing a tax return are two different things. In fact, you file a tax return to show that you've paid all the tax you needed to pay. The income tax return is also a very useful document when it comes to applying for a loan or visa.

You can file ITR 1 if the agricultural income is up to Rs 5,000. For agricultural income exceeding Rs 5,000, you have to file ITR 2.To know about ITR 2.

Yes, you can file income tax returns for the years you have missed. However, you can file previous year returns manually after contacting your Assessing Officer. For F.Y 2017-18, you can only e-file the income tax returns up to 31 March 2019. No past years' returns can be e-filed.