Registers (IDA PRO)

There is one question that torments me as soon as I go to practice in the disassembler, in each game or application there are different registers in the function (R/S/W/X), I don't understand if there is a difference between them? are they just coefficients in front of numbers ?, for example R7/W0 etc. or does each of these letters have some meaning? I am a resident of Russia and, unfortunately, I cannot find sensible textbooks on Ida, and foreign textbooks are too difficult for me for linguistic reasons. Help me understand these registers. THX

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