Advice on designing hardware interaction between an MCU and a host for beginners

[rayan]

I am a beginner in electronic design and I am currently learning to read datasheets and draw schematics . I am interested in designing hardware interaction between an MCU and a host. Could you please advise me on some key considerations, such as voltage compatibility? Are there any resources available for beginners, or a complete guide to designing electronics for beginners?

[rstofer]

If the MCU and 'host' can be the same SBC, you might look at the Raspberry PI 4 and, ideally, one of the starter kits.  The PI acts as an MCU in terms of wiggling pins and working mechanical things but it also runs Linux which provides a high level interface with code written in high level languages like Python, C or even Java.

There's quite an education in these kits and all code is provided

https://www.amazon.com/s?k=raspbrerry+pi+starter+kit

The Raspberry Pi 4B is extra (I would go for the 8GB variant).  You need a monitor (HDMI), keyboard,  mouse (USB) and microSD card (128 GB).

https://www.amazon.com/s?k=raspberry+pi+4+8gb

You could also consider the Pi 400

This setup allows very high level control of the IO pins.  You could set up the Pi with a Berkeley server socket and control the Pi from anywhere on Earth.  You might need a hole through your firewall for a specific IP address in order to reach the Pi from beyond the LAN.  But it's doable...

[tggzzz]

I am a beginner in electronic design and I am currently learning to read datasheets and draw schematics . I am interested in designing hardware interaction between an MCU and a host. Could you please advise me on some key considerations, such as voltage compatibility? Are there any resources available for beginners, or a complete guide to designing electronics for beginners?

This is so ill-defined it smells of being LLM output.

The OP should read
https://entertaininghacks.wordpress.com/library-2/good-questions-pique-our-interest-and-dont-waste-our-time-2/
or similar