You can disable all this stuff easily.
1. When installing you are asked if you want the default settings. Select custom settings and turn everything off. Things like Cortana that rely on having data about you won't work, of course.
2. Open the Windows Update settings and go into the options. Disable downloading updates from other machines on the internet. You might want to leave the option to get updates from other machines on your LAN enabled though, to save bandwidth.
If anyone is any doubt that you can disable all the "spying" stuff, consider that enterprise users would demand it or simply refuse to use Windows 10.