Whether you need to file, depends on your income for the year. If your income is less than the following amounts, you are not required to file a tax return.
Single or Married Filing Separately, under 65 - $12,550
Single or Married Filing Separately,, over 65 - $13,900
Married Filing Jointly, under 65 - .$25,100
Married Filing Jointly, over 65 - .$26,800
You may want to file a return, even if you are not required to file. If box 2 of your W2 has a number greater than 0, it is possible you will get a refund.