More devices connected to RPi GPIO

[nohepe]

Hello, sorry for dumb question, but I am really newb regarding hw. I would like to connect folowing devices to my RPi:

- temperature sensor
- relay controller
- motion senzor
- magnetic senzor (open/closed window checker)

Am I able to connect those devices at once? What kind of problems could occur there? What about power distribution? Can I use common GND and 5/3,3V source? Any ideas how to connect those devices at once? I have no experience in this area.

In theory I think that I can control any GPIO port, but I am not sure if I can share those 3,3/5V source pins and GND.

If you have any learning resource regarding this topic that could be nice, thank you!

[Massi]

duplicate
viewtopic.php?f=44&t=141343&p=935663#p935663

[texy]

Yup.
Locking.

Texy