Boot Camp supports 64-bit versions of Windows 10 when used with a supported Mac.

updating nvidia bootcamp-67

As with installing any low-level software, it is advisable to create a backup beforehand, so that you can roll back, should something not work as planned.

The most important driver upgrade IMO is graphics drivers.

Is it safe to update drivers from Nvidia site, some other sites(for other drivers) or Apple releases special type of drivers for there hardware and only those will be supported?

The important Apple drivers which Windows invariably doesn't have updates for are Facetime camera, Apple keyboard/trackpad/mouse, and the IR receiver.

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You need at least 10 GB of free space on your Windows partition.

If you have Windows 8.0, update to Windows 8.1 before upgrading to Windows 10.

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I see my Nvidia card's support software always says new update available.

I’ve experimented with several drivers including 3rd party drivers before settling on the latest official driver from NVIDIA.