The CRA recommends that you go in order, so you can start with 2021.

Thanks, if i choose one of the produ ts you offer, can i use it to file previous years or it has to be used to file 2023 only, thanks

Each year of TurboTax only has the forms for one year, so TurboTax 2023 can only be used for your 2023 tax return.

So can we file prior years by Turbo tax platform? How? Thanks 

You can see what we have available for previous years on our website here: https://turbotax.intuit.ca/tax/software/prior-year-taxes