Which model to buy? For most people the Raspberry Pi 5 (8 GB of RAM) is the one to choose. It is the newest, fastest, and easiest to use. If you manage to get a Raspberry Pi 3 for free, that would be the minimum requirement to learn programming with Scratch or Python.

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Besides the single-board computer Raspberry Pi 5, there is the Pi 500. It is based on the Raspberry Pi 5 with 8 GB of RAM build into a keyboard. Unlike the Raspberry Pi 5, it lacks a PCIe interface. The Raspberry Pi 500 Desktop Kit contains the essentials you need to get started. When ordering the Pi 500 select the correct keyboard layout and the correct power supply for your country.

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Source: wikipedia.org