Matter Transmutation

These questions may come off as cringy but I don't have a great understanding on physics

1. If you create a black hole in one hand and a white hole and the other, then try smushing them together, what happens?

1. If you can turn water into sand is that matter transmutation or elemental transmutation?

2. How exactly is gravity manipulation the weakest of the four fundamental forces ? I mean, you can potentially make black holes and throw planets around like soft balls or even distort the space time continuum to an extent?

3. So quantum manipulation gives you all kinds of crazy powers like traveling to different realities and detonating stars. What does relativity manipulation do? Make you move at light speed?

4. How does quantum manipulation give you the ability to transmute matter into practically anything you desire via nuclear manipulation? I mean sure you can turn sand into glass or water into ice, but can you turn concrete into electricity? Air into blood? Wood into lava? Lead into pizza?

Transmutation is an underrated power that I don't see talked about much around here. It's applications are diverse and have solid foundations for those who like to rely on real-world science to "explain" or make sense for the power. You see, at a glance it might even be a little difficult to think of an attractive use for this power, also because people here opt for things of omnipotence, but Transmutation is very useful and applicable, you can transmute practically everything, since everything is matter and energy, and everything is made up of atomic and subatomic particles, molecules, cells, etc. All of this can be changed, rearranged, reconfigured or transformed. Which means you can simulate both the creation and destruction of matter. You can transmute air molecules to "create" matter from "nothing" or the opposite by transforming matter into air (oxygen) to "destroy". From there the sky is the limit. Even immortality, as you could transmute your own cells into new ones, strengthen your body and all that. Imagination and creativity is the real limit, because in nature nothing is created and nothing is destroyed, everything is transformed, and that's what this power does.

And for those of you who like to be science-based, this power is basically Strong Nuclear Force, or an application of Nuclear Manipulation. Nuclear Transmutation already exists in the real world, despite being very difficult and limited to experience.

Just as the title says

So I’m very confused on how you can use Matter Manipulation in a fight and how it works. Can someone give me scenarios please?