this is a very good kit to start with Arduino or raspberry pi it consists of multi essential sensors and items:
Pir
rain detector
IR + remote controller
DHT11 for temperature and humidity
pot
16*2 LCD
stepper Motor + Driver
Relay Module
Serial converter
Transistor
2*LDR
PushButtons + caps
LEDs
resistors
Male pin headers
Breadboard
flex cable for raspberry pi