I stopped a freelance online teaching job in the winter of 2020 but then restarted it again in the summer of 2020.. how should I answer Did you stop working edu in 2020?

[AnnetteB6]

You should not check the box to say that you stopped the work during 2020.  

The question is essentially asking if you have stopped doing the self-employed work and you do not expect to continue it in the future. Stopping for a short period of time and then starting it up again during the same tax year would not be considered stopping the work.