Do I need to file taxes if I earned less than $12,000 for the year? What happens now that I begun to file but did not submit the return?

If you began a return on TurboTax Online, but are not required to file, then there will be no fees and you do not have to finish the return. These are the federal requirements, below. 

You might not need to file a return for 2022, if you are below the filing threshold and do not have a requirement listed below. 

You also must file a federal return if:

• You had $400 or more in self-employment net earnings (gross income minus expenses)
• You had marketplace health insurance and you received advance payments for the premium tax credit
• You (or your spouse if filing jointly) received health savings account, Archer MSA, or Medicare Advantage MSA distribution
• You had wages of $108.28 or more from a church or qualified church-controlled organization that is exempt from employer social security and Medicare taxes
• You owe any special taxes, including any of the following:
  •  Alternative minimum tax
  • Additional tax on a qualified plan, including an individual retirement arrangement (IRA), or other tax-favored account
  • Household employment taxes
  • Social security and Medicare tax on tips you didn't report to your employer or on wages you received from an employer who didn't withhold these taxes
  • Uncollected social security and Medicare or RRTA tax on tips you reported to your employer or on group-term life insurance and additional taxes on health savings accounts
  • Recapture taxes
     

Did you get a W2 for it?  If you only got a W2 you don't have to file except to get back any withholding taken out in box 2 and 17.  Or if you got a 1095A if you had Marketplace health ins.  Oh,  does anyone claim you as a dependent?