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At least you need a microphone, XLR cable, audio interface, headphones/monitors and a recording software like Protools, Cubase, Logic etc. when you record with a computer. We have published a “Recording Basics” tutorial series that might help you even further. Watch Part 1 here: https://youtu.be/o9JzrRl5aYA.
Stay away from the cheapest models; 200 dollars/euros is about the minimum for a decent audio interface. Good ones, which offer superior sound and better quality overall, start at about 400-500 dollars/euros. Read more here: How to connect a How to connect a microphone to your computer.