How to install Ruby on windows 7, 8, 10

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I dont have the doc folder with the documentation T____T thanks for the video, is helpfull

i already download it and it said the file have virus

thank you

good video

Thank you for you video. Please I have a question: I saw other video where it was suggested to download the following:
Ruby 2.3.3 documentation (CHM format)
Do you think it is important?
Also I am very new to ruby and I would like to know if there is any video for beginners I mean complete beginner that you will suggest
Thanks!

hi. cmd prompt says - ruby is not recognized as an internal or external command, operable program or batch file?
i downloaded a ruby 2.3.3 for 32 bit windows?