What simple controller for ventilation, heating and roller shutters - operation of 6-8 relays?

Please advise which controller to buy to make it as easy to program as possible. i have never had any experience with programming, and am generally new to computers.
What I want to do. To set up a ventilation and heating system in the house with energy loading from the roof collector into the ground slab and DHW. Roughly speaking: if temp in house TD <23st and temp at bucket 1 TC1 >23 turn on bucket 1 (means relay), if TD<23 and TC1<23 and outdoor temp TZ<-5 turn on GWC-ground heat exchanger (relay), if TD>23 and temp TZ>24 turn on GWC (relay) and Bypass (relay). If TW>23 and illumination greater than (illumination sensor here) then lower blinds to specified level. etc....
You will need approx. 6-8 relays, there will always be several conditions to be met at the same time, so connecting relays in parallel is rather out of the question as it would be too much.
It would also be nice if one of the circuits could control the motor speed depending on the temperature.

Arduino? Raspberry? plc? Lan controller?

If anyone has done something similar and can share/resell the software then please PW

See what telmatik has on offer - I mean the sr series controllers. It is programmed by combining logic gates and the like in a schematic. Soft download for free from the manufacturer's website and it has a simulator. You'll also find sensors and more on the site.

The simplest to program? Simple is what someone can do. There are some controllers and cheaper and more expensive ones.
Maybe you should be interested in solutions based on PLCs integrated into a panel or ones to which an operator panel can be connected?

Firstly, you need to think carefully about how many input signals you will have (valve states, temperatures) and how many output signals you will have (whether just discrete - valve on/off or maybe something else).

This will allow you to select the controller optimally.
It would be good if you specified at least approximately the budget you intend to allocate for your solution, because this will already limit the number of possible solutions.

Thanks for your help. The simplest one is one that EVERYONE can or should know how to program.
Indeed this telmatik looks just like that. i have read the description and should manage. Following gerve's advice, I counted the inputs and outputs and ordered the simplest version of the SRa to start with the controller for the ventilation and roof collector because that's the most important thing for me.

And now I've started to think about maybe doing something more on it - CO heating cables in each room and DHW and here's a little problem. Is it possible to bypass/replace these temperature sensors somehow, so as not to take up so many inputs on the controller and not to buy such expensive sensors with temperature transmitters? You would need 2 per room and for the whole house this would add up to a good amount. Is it not possible to connect such controllers with DS1820 sensors after 1-wire? or is there another way to have a large number of temperature measurement points?