Hi @Varun_Katyal ,
It is not mandatory to file ITR in case your income is below the basic exemption limit of INR 2.5 lacs. However, it is always a good practice to file ITR since you can claim the expenses and deductions.
You are required to file an ITR if your income is more than INR 2.5 lacs.
Since intraday is treated as a business income it will be taxed at the slab rate.