Going by the current guidelines, it is advisable to link your PAN to Aadhaar. This you can do on the portal. However, the deadline is till June 30.
Individuals who earn up to Rs. 50L from salaries, properties and other sources (including interest) should fill the ITR-1.
During filing of returns
While filing, make sure that the income, deductions and other details mentioned in your returns match those given in the Form 16/16A. If there's any discrepancy, it will cause a delay in the processing of your returns or increased tax liability.
After you are done with the filing
After filing, you have to e-verify your return either physically or online. For the former, you can send the ITR-V to the Centralised Processing Centre (CPC) in Bengaluru.
For online, you can use bank ATM, net-banking, Aadhaar, bank account or demat account.
After your filing is approved, refunds, if any, will be credited directly to your bank account.