If you have a Google account, and are logged on to Google mail (gmail), then you can switch off certain features that track you.
I am pretty sure you can only do the instructions below if you have a Google account (gmail) or a gmail account on your Android phone or tablet. If you have a Microsoft account see the bottom of his update.
If you are logged on to Gmail do as follows (probably easier to do this on a PC rather than a smartphone).
Go in to Gmail and select the 9 "dots" in the top right. This displays a window of Google Apps.
Select the Account icon.
Select one of the options "Manage your data and personalization"
Here you can turn off Activity controls such as "Web and app activity", "Location history" and "YouTube History"
These basically track EVERYTHING you do on the web.
Underneath you can also turn off "Ad personalization" (these make ads more "general" rather than based on your searches etc)
There is also a option called "Go to Ad settings" where you can make selections.
Back on the main Account window there is also a section "Activity and timeline" and within that a section "My Activity".
Here Google keeps EVERY search you have ever made, plus all you have done on your Android phone if you have one.
Select "My Activity" then select "Delete activity by" then select "All Time" then "Delete now".
This will delete ALL your Google search history.
You can also select "Timeline" and delete that as it tracks where you have been (probably using GPS on your phone or tablet or laptop).
There are many other options in this "Account" area so while you are in there it may be worth turning everything off to stop Google tracking you.
Note that with Windows 10 Microsoft are playing catch up to Google so they have started tracking everything we do.
So if you have a Microsoft email address to logon to Windows 10 (outlook.com for example) then go to this web site (link below) and logon with your Microsoft email address and see if you can change or turn off options there similar to the Google options above.
Sign In with your Microsoft account. One account. One place to manage it all. Welcome to your account dashboard.
account.microsoft.com
It is rather frightening how much Google and Microsoft (and Amazon and others) track what we do so turning of many of these options stops them tracking us.