Retirement tax questions

 If I convert my 401k IRA to a 401k Roth, let's say a portion of it - 50k (would pay the taxes outside of the plan) that is a prefered method to do it to preserve the corpus in the IRA

 

 

, can I still contribute to a regular Roth IRA outside of my plan?  Of course if you otherwise qualify.   A Conversion is NOT a contribution so it doesn't affect the ability to make a contribution.