Hi,
As far as Windows Programs\processes goes, there are very few that can be disabled safely...
The Apps are a different story... If you click on Start, and then right click on the Apps you see, a menu will pop up.. If you click on "MORE" you will see "Turn Off Live Tile"... Some will have a Uninstall option if you wish to do that...
If you click on the Icon on the lower right of your Desktop screen you will see All Settings... Select this, the "PRIVACY"...
Way down new the bottom of the menu on the left you will see "Background Apps"... Here you can turn off the ones you don't want running...
You might find some other interesting settings in "Privacy" while you are there.