When it comes to privacy it is always difficult to understand what it means and what to do, it is a delicate subject, and there are many fears and fantasies about it, in this case we must first understand how we want to live our media experience on the internet.
In the modern world there are many services that help the user in his digital life, performing many automatic automatisms for us.
To do this in many cases, the software needs to have a set of our usage data to create and analyze our digital life and create the personalized service.
Basically it's a good thing, created to help and automate, to make us humans work less.
The problem arises when a service created for us humans becomes or can be used in a bad way for commercial or market research purposes, in short, for speculative purposes.
The more we talk about Privacy, the more we have to give up a series of "simple" services, but the extremes are always difficult, the solution would be to live alone in the middle of a forest and live on mushrooms, moss, and without internet.
I would say very impractical, but without being extremist, you can implement a series of attention in everyday work, avoiding being too exposed on the internet.
To do this, we can start from the security of our browser, the main tool that we use massively all day.
One of the best AD block (advertising on the web, not on Facebook) with other services related to the traking block.
Essential extension.
2- DuckDuckGo Privacy Essential
DuckDuckGo is the all-in-one privacy app that helps protect your online activities. With one download you get a new everyday browser that offers seamless protections from third-party trackers while you search and browse, and even access to tracking protections when receiving email and using other apps on your device. With DuckDuckGo, privacy can be your default.
3- Ghostery
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
4- uMatrix
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
uMatrix: A point-and-click matrix-based firewall, with many privacy-enhancing tools.
Some services are similar or almost similar, you don't have to install all the extensions, but evaluate which one is best for us or balance which other one works well with.