Assuming you are a simple return with just W2 income, you can start in the present and work backwards. However, if you have a small business, with depreciation items, and or carry forwards / losses from investments, then you will be best served to start in the past and work your way forward.
This is the link to get the software back to 2019, as we only support backwards that far.
https://turbotax.intuit.com/personal-taxes/past-years-products/
You will need to get the prior years software from somewhere else (IRS, Amazon, etc.), or paper file yourself.
Hope this helps. Just have to get started.