On another topic, On another hand, And then
Off topic, On a side note, Off on a tangent
Back to the point
In short, Sum it up, Summarize
They discussed regarding the book.
The idea is good.
I am making bread, then I will cook pasta.
On Another Topic
Money aside, what do you want?
Off the topic, do you like them?
Back to the Point
Back to the point, do you want to eat?
In short, they want you.
Please elaborate about the restaurant.