This varies greatly from who is tracking and what security measures you have taken. For example, if you used a public Wi-Fi hotspot to access your internet banking without any security measures, your banking information could easily end up in the hands of a hacker. Also, Google can clearly see what you are searching for. But luckily, while some people can see and track a lot of what you do online, there are many steps you can take to significantly increase your privacy. You can check these measurements in our article on anonymous web browsing.