Do I need to register for Self Assessment and send a tax return?

Hi HMRC Admin, When I checked through the link https://www.gov.uk/check-if-you-need-tax-return, system said that I do not need to send a Self Assessment tax return. However, when I went through the steps via link https://www.gov.uk/register-for-self-assessment, system said that I need to register for Self Assessment and send a tax return. Therefore, I want to know which instruction I should follow? Thanks ACTS

Hi
Without knowing your financial/residential circumstances, we are unable to give you a definitive answer.
However, if the Self Assessment criteria tool indicates that you should complete a Self Assessment tax return, we would suggest that you do so.