I have Always file my income tax however for the year 2020 I did not work at all. I just filed my income tax for 2020 but I included my 2019, should I have done that?

I did the natural disaster section where I  placed my two economic stimulus payment. Now I do have two young dependent children that I claimed. My question is did I do the right thing by including my 2019 income tax or should I delete that and just include my dependent and the stimulus payment that I received? I also was only told to mail in my information rather than electronic. Why is that???