Retirement tax questions

In an effort to supplement our social security, I began selling thrifted items on eBay and Poshmark.  During 2020, due to the pandemic and my spouse's compromised immune system, I quit thrifting.  My total income from reselling in 2020 was $6,274 (not my $5,000 guesstimate as previously stated).  So total income from social security and online selling during 2020 totals $35,675.  Thank you for trying to help me.  Being unexpectedly saddled with doing taxes when I am so utterly inexperienced has been very stressful, so I am just so grateful!