hap AC2 router ans home setup

I have purchased a Mikrotik hap ac2 router to add security to my home network. My home network is served by a SKY router the Mikrotik will be used to create seperate segmens for my HomeAssitant smart home network and various smart devices such as thermostats, switches, lamps and so on and tv’s. I want it to be seperate from my main network for security purposes.
My home network has my main pc’s, NAS servers phones and so on. The main network is on 192.168.1.*** i want a seperate wireless netork on the hap for smart devices such as Amazon alexa but it needs access to the internet and for various smart led controllers but i also need a wired network for my Raspberry pi which runs my Home Assistant server.
The hap ac2 is connected via an 8 port ethernet switch in my study to my main network switch which is attached to my SKY router.

Now, i am a 70 year old old age pensioner, i was involved in I.T. 20 years ago but have forgotten so much and things have moved on. Treat megentyly but as a complete novice.

Please could you help me configure this as i am a total novice with Router OS.

Your hAP ac2 is configured already for this.
Ether1 is the port to connect to your home network.
Ether 2-5 are the ports for the local network. They will reach internet ad the home network via ether1.
Both radio’s are sending out a wifi network already. You can change the SSID name and security profile. Clients will reach internet and the home network through ether1.
The home network cannot reach hAP ac2 local network, with this setup.

You can install and use WinBox for management. But the HTTP access will work as well (from the wifi connections, or from ether 2- till 5. (Ether1 is not open for management !))
You can set the easiest things with “Quickset” and mode “Home dual AP”. That’s a one time start, the powerfull settings are not done in Quickset (and Quickset may destroy whatever else you set via Webfig. So once using Webfig don’t go back to Quickset).

With WinBox or Webfig the options are endless, so you will need to explain what you want if you seek help. (E.G.: " I want to separate the wireless Raspberry Pi from all the rest. I want my devices on ether3 to be able to talk to the Home controller on ether4, but not to internet. etc etc". A global overview of wishes is needed to start a network design.