There are several models of Raspberry Pi, and for most people Raspberry Pi 4 Model B is the one to choose. Raspberry Pi 4 Model B is the newest, fastest, and easiest to use.
To connect to a power socket, all Raspberry Pi models have a USB port (the same found on many mobile phones): either USB-C for Raspberry Pi 4, or micro USB for Raspberry Pi 3, 2, and 1.
Your Raspberry Pi needs an SD card to store all its files and the Raspberry Pi OS operating system.
To start using your Raspberry Pi, you need a USB keyboard and a USB mouse.
Once you’ve set up your Raspberry Pi, you can use a Bluetooth keyboard and mouse, but you’ll need a USB keyboard and mouse for the first setup.
To view the Raspberry Pi OS desktop environment, you need a screen, and a cable to link the screen and your Raspberry Pi. The screen can be a TV or a computer monitor. If the screen has built-in speakers, Raspberry Pi is able to use these to play sound.