2. Turn off your location tracking
Next in the Privacy screen, head to the "Location" area. Here, you can tell Windows to stop tracking your location entirely or choose specific apps that can and can't use your location.
Location is useful for apps like the weather or when you're looking at maps because you don't have to put in your address every time. However, other apps might use it to keep tabs on you.
Cortana, Windows 10's built-in personal assistant, uses your location to suggest items of interest near you or learn the places you like to go (if you're using a laptop or Windows Phone).
3. Turn off ad notifications on your locked screen
Microsoft also has a way of sneaking ads through Windows 10's lock screen via the "Windows Spotlight" feature.
To turn off Windows 10 lock screen ads, on the same Settings page, go to "Personalization" and click the "Lock Screen" section. Under "Background," switch to another option other than "Windows spotlight." (You can set it to either "Picture" or "Slideshow.")
Next, on the same page, scroll down and turn off "Get fun facts, tips, tricks, and more on your lock screen." These tweaks will stop ads and tips from invading your lock screen.
Bonus: Turn off your advertising ID
Like every other major online company, Microsoft is using targeted advertising to drive revenue. That means it's sending advertisers your data so they know what ads to send you. While you can't shut off the advertising, you can stop advertisers from seeing what you're doing.
In Privacy, go to "General" and switch "Let apps use my advertising ID" to Off. Now, advertisers won't get your advertiser ID when you visit a page.
You can click the link for "Manage My Microsoft advertising and other Personalization info" to set your global Microsoft Account preferences for seeing advertising on other Microsoft products. Note that if you're using a local Windows account, this link won't do much.
In "General," you might always want to turn off "Send Microsoft info about how I write," although Microsoft says this is just to improve auto-correct and handwriting recognition.