system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] What does the Soul Stone actually do?

If I were to acquire the Soul Stone, how could I use it? What abilities does it have? Can I use it in combat?

Yeah, with the rest of the stones the Soul stone is very powerful and its potential gets fully unlocked, but without the gauntlet, without the other stones, how can I use the Soul Stone? I know that the stone is connected to ''souls'' but what does actually mean and how useful is it?

Can I for example take the Soul Stone and have some random guy teleporte/trapped inside of it?
gpt
When Doctor Strange created a number of illusions of himself, Thanos used the Soul Stone to identify which was the actual Doctor Strange, so it at least has the ability to detect and identify life/souls.

Since Thanos needed all six Stones to snap half of the universe away, the Soul Stone likely played a part in that. And if every stone had a unique role in the Snap (and in undoing the Snap), the most likely role for the Soul Stone that wouldn't render another stone irrelevant would be for the Soul Stone to kill and bring people back to life. (If the Soul Stone was just being used to identify everyone that's going to vanish, then that would make the Mind Stone superfluous and wouldn't explain why the vanishing people often felt like they were dying before they vanished.)

So the only confirmed and implied powers of the Soul Stone at the moment in the MCU are the ability to detect souls, the ability to kill, and the ability to resurrect. And it potentially houses another dimension inside of itself, explaining why Thanos spoke with young Gamora when he received the Soul Stone.

So it's too soon to say if you could trap someone in another dimension with the stone at will, but you could probably remove his soul/kill him, and/or bring dead people back to life with it.