In 2020 when i got my stimulus i started trading for the first time options and stocks and i forgot i had to file those transactions how can i update all my taxes?

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-already-filed/L4VjJ9BA2_US_en_US?uid=lddpdarj

You should have received forms 1099-B reporting the investment sales. You need to amend the prior year tax returns to report that information. If you held your investments for more that one year, your capital gains may not be taxable, depending on your income.