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I hope you don't mind - I copied the image from Imgur ... for some odd reason I couldn't even load it without doing some extra effort.
So I'd start with making a bill of materials needed:
I think the confusing part may be the display section. The "I2C" and the "LCD" can be bought as one single item, or as two items: a LCD screen and a I2C module.
More details can be found here: Arduino LCD I2C tutorial.
The load cell has 4 wires, and they go to the HX711 module:
LOAD CELL HX711 ----------------------- Green (Sig +) -> A+ White (Sig -) -> A- Black (Exc -) -> E- Red (Exc +) -> E+
The HC711 module has 4 more pins to connect:
VCC -> +5 Volt GND -> Ground (or minus) CLK (or Clock) -> Arduino Pin 2 DT (or Data) -> Arduino Pin 3
The Arduino is has a push button and a resistor on the pins A0 and A1.
The buzzer goed on Pin 13 of the Arduino.
The I2C of the LCD is connected to Arduino Pin A4 (I2C pin: SDA) and Arduino A5 (I2C pin: SEL) of the Arduino.
Note: The Arduino will also need +5V and GND connected (the schematic is not showing this, which is not uncommon).
The LCD display needs +5V and GND as well of course.
Since this all is pretty obvious to me, tell me where you're getting stuck and I'll try to explain ... 😊
