Income is income
Ads, gifts that convert to cash, sponsorships, affiliate commissions, and product sales are commonly taxable. The forms and the thresholds depend on your country and sometimes your state or province. Set aside a percent of every payment so the bill is not a crisis.
Keep invoices, platform dashboards, and receipts. A notes app is better than nothing. A spreadsheet you update on payday is better than that. This is not tax advice. A preparer who has seen creator income will cost less than a guess.