The vertical direction is slightly behind the shoulder.
This kind of difficulty is greater, mainly to practice triceps brachii and chest muscles.
It's the part of your chest near the armpit.
According to your situation, I recommend you to practice the second one.
The two palms and fingers are opposite, horizontal, with a width of one and a half shoulders, and the vertical direction is flush with the shoulders.
This is mainly to train the front muscles of your chest and chest expander.
Remember to do it with your chest, not your arms, or it will be useless.
That is, when you go down, you feel your chest stretch to both sides, and when you get up, you clamp your chest inward.
If you feel this way, your posture is right, otherwise don't practice, you are practicing your arms.
It is important to master posture and the feeling of chest muscles.
Do you have dumbbells? It is also a good choice to use dumbbells as bench presses.
Using dumbbells may not be as effective as push-ups.
But reducing fat is still quite effective. I wish you success!