Things that can make it easier for the newly minted Reddit expats to 'get' the new interface

I think maybe the single biggest one is putting the 'post' plus sign front and center. Everyone's gonna want to make their 'hello world, I am here' post and the ones that can't, will go 'well that place is a mess, I can't figure it out' and go on their way.

The second thing: instructions on how to include pics

I think MB the best thing to do would be for someone to cut a brief screen share video walking people through the basics and sticky it or else create a new tab in the banner for 'Start Here' that can start new users on their journey properly.