Hi, weird enough I couldn't find a clear answer on Google.
So, I have an ESP32, and I have a screen, a PIR motion sensor and a button wired up. All 3 components need a wire each to 3V and GND. I use a breadboard now to try things out.
How would I solder this up? Can I just let 3 wires arrive in the 3V/GND hole (A)? Do I solder a wire to 3V and a wire to GND and then let the 3 wires arrive to that wire? (B)
Or do I just get it all wrong here? Thank you!
Mounting the ESP on a printed circuit board (PCB) would be the best method of doing this, but you could easily use perf board to achieve the same thing.
Connecting 3 wires to the same pad on the ESP is likely to be less satisfactory but can be done
Usually you would either design a PCB or, for simple projects likes this, use stripboard or protoboard. Then you can solder the esp32 board to the stripboard. Then there is no problem attaching as many wires/components to 3V3 or GND as you need.
You can solder up a 3.3V and GND distribution points in whatever fashion that you wish. Some physical configurations work better than others.
It begins to matter when components which you connect, draw significant power and rapidly switch how much current they draw.
Either option will work fine, and electrically are pretty much the same thing.
You need to be careful powering too much via the ESP 3.3v pin - this is not a power supply, and can only deliver limited current.
Also, not sure why you have 3v and GND going to your button... when you press the button do you connect 3v to GND? That would not be a good thing.
Oh yeah my bad, button is GPIO and GND. 
Ok good.. your ESP will last longer that way.
It may even work! 
How are you going to house the board and components? That might influence how you can best join the wires.
As small as possible, I want to pack it in a 3D printed case as small as I can, together with a small battery. A low power project that can hopefully run a year on a battery.
Little hint here, trivial but ...
You should not delete posts and post again - just edit them with the "pencil" icon below. 
What kind of display do you plan on using?
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