Retirement tax questions

Thank you.   

 

Follow up question;   My 2020 AGI is too high for me to make a full $7,000 Roth contribution (I'm over 50 years old).   It looks like I am able to contribute around $900 to a Roth for 2020.  Can I make that $900 contribution and apply it towards 2020 return...and then do a Full $7000 Back Door Roth contribution for tax year 2021?