Do you suspect that someone is checking which websites you have visited? Every website you visit is saved in your browsing history, both on your computer and on your mobile. Therefore, remember to either enable private browsing mode, so that no history is saved when you surf, or clear your browsing history after you are done.
How to surf in private mode (“incognito”):
Incognito mode in Chrome (PC, Android and iOS)
Incognito mode in Safari/iPhone
Incognito mode in Microsoft Edge
How to clear your browsing history in different browsers:
Clearing your browsing history in Chrome (PC, Android and iOS)
Clear your browsing history in Firefox