Where on site tells me if even need to file.

If you have earned income exceeding the standard deduction for your filing status, unearned income more than $1400, or net earnings from self-employment exceeding $400, you must file a tax return. 

You may wish to file one if you are entitled to a refund of withholdings or are entitled to any refundable credits.

The standard deductions for 2024 are:

• $14,600 for single filers and married people filing separately
• $21,900 for heads of household
• $29,200 for joint filers and surviving spouse

Individuals who are 65 or older, or blind, receive an additional $1,950.  ($3,900 if both)

For more information see Do You Have to File an Income Tax Return.