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We at Just Answer do not represent Lenovo and are independent computer experts.
That being said, Lenovo does state that the Yoga 2 should be Windows 10 ready for upgrade: (https://support.lenovo.com/us/en/documents/ht103535)
Windows 10 very similar to Windows 8.1 and if you are comfortable with 8.1, 10 is an upgrade I would highly recommend.
Windows 10 has some tutorials for what's new and they are available here for review: http://windows.microsoft.com/en-us/windows-10/support
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