I stumbled on a video that provides the clearest explanation I have seen about round trips from LR to PS. You can find it here: https://petapixel.com/2020/02/05/the...and-photoshop/
Because I do a lot of editing in LR, I do this round trip all the time, but even so, I found one important thing I didn't know. (Warning, it didn't start until the latter half of the video.) That trick was a method for using a virtual copy and LR's sync feature to preserve both PS layers and later LR edits when going back to PS a second time.
If you don't do this often, even some of the more basic points in the video would be helpful. For example, I learned the hard way a long time ago something that Steele explains clearly: never use File-Save as to end the PS part of the round trip.
I had never encountered any of Steele's videos before, but I like his teaching style. He paces himself very well and provides very clear and well-organized explanations.