There are a few new things that are probably not known because other things received more attention with the massive 2019 Rules Changes.
I prepared some stuff for my Club contacts. Some of it follows.
For my contacts I added some material showing the significance of Marking Lifting and Replacing with a ball moved on the putting green by Natural Forces. See 9.3.
It is reasonable to think that means only picking up the ball, lifting it a finite distance above the spot where it lies.
There is much more now!
Marking, Lifting and Cleaning Ball
“This Rule applies to the deliberate “lifting” of a player’s ball at rest, which includes picking up the ball by hand, rotating it or otherwise deliberately causing it to move from its spot."
This introduces new concepts on the meaning of “lift”.
A spin or rotation around the ball’s axis without necessarily moving the ball off the ground is a "lift".
Moving the ball off its spot is also “lifting” in the new jargon. The ball does not have to lose contact with the surface.
Visualise placing a ball-marker behind the ball, holding the ball between thumb and fingers and rotating the ball on its spot without any loss of contact with the surface. You might do this to line up a stripe on the ball. You have “lifted” the ball. When you release the ball on the spot it has been marked, lifted and replaced. Remarkable!
“Otherwise deliberately causing it to move from its spot."
"Ball May Be Lifted in Any Manner
There are no restrictions on how a ball may be lifted so long as the ball is not lifted in a way that deliberately tests the putting green (Rule 13.1e).
For example, after the spot of the ball is marked on the putting green, the player may lift the ball with the back of the putter or may move it to the side with a club." (Interpretation 14.1a/1)
Casual knocking the ball away to the side with the back of the club for example, has been stated as acceptable in past Rules. Decision 20-1/22.