I forgot to add document in previous years

So I forgot to add my Robinhood Tax Documents 1099 when i filled last year for the year 2020, and i Forgot to add my College 1098-T form from 2020 on my 2019 taxes i filled.Reason being, I thought Every document was like a W-2 arriving by Jan 31st, and didn't know1098-T i would get one as i didn't know it existed, and was my first year with stocks and had no clue either not thinking.

 

Can i Amend these still? Is it too late? What do i do? The whole sales for my Robinhood was about $200, and i forgot to add all my expenses for my College two years ago as I am new with filing taxes, I am now 20, and was 18 and 19 then.