[Domoticz] How to integrate Arduino Uno with sensors via cable?

Hello.
I'm having quite a problem understanding what is for what.
I have domoticz installed (on win currently). In order to learn
I bought an arduino uno, to go with it a temperature/humidity sensor. ,
and a sound intensity sensor.
I cannot understand the concepts and the tutorials generally available. I wanted to have the system on cable, but most tutorials are on wifi.
I understand it like this:
Domoticz is the system.
The arduino is; ?
A sensor is a device for reading data.
Names like MySensors, z-wawe, ESP8266 , etc appear.
I can't seem to put it together.
Greetings.

as far as I can see:

Domoticz is a system.
agrees .

arduino to; ?
microcomputer .

A sensor is a device for reading data.
including, for example, tmeperature, humidity, light .

Names such as MySensors, z-wawe, ESP8266 , etc. appear.
z-wave is the transmission protocol used by e.g. the fibaro system, ESP8266 is a module, controller, found mostly in Chinese switches [/b].

So generally in automation it goes like this:
you have a controller (arduino) - because a PCet is not suitable for controlling the actual process.
you have a visualisation system, and various setpoints - here it can be a PCet.
you have input elements - various sensors, buttons, limit switches and whatever else you want.
you have output elements (actuators) - various relays, contactors, speed controllers, etc.

if you want to have a wired system, use mysensors gateway + rs485 converter (tiny gateway on arduino nano v.3.0), to receivers which will "transmit data" from sensors on arduino mini pro 328P + rs485 converter + various sensors, read about it on mysensors website.
Long distance communication, without obstacles, power supply you can give 12V or 24V of course modules through a stabilizer at 5V.
Alternatively, if you can't wire it, you can use esp8286 or 8285, with espmega or espeasy software (same thing, but mega is more powerful and developable, espeasy less so).
There are also other possibilities, e.g. rflink + 433 MHz receivers for popular remote control sockets / rain sensors etc., 2.4GHz receiver modules, the same as mysensors but without wired, or 8.2GHz etc.

Many tutorials on the net, I recommend raspberryepi and similar

I am already after testing. I created a prototype on a contact board. Three different sensors on an arduino, mysensors library. mysensors gateway. Transmission rs485. Operation via domoticz. Works everything correctly.
Thanks to.