Even though Google Analytics helps us a lot to improve our website, the integration of the service is not mandatory for functionality. You can decline the integration.
We do not track our visitors. We don't even use any cookies unless it's needed for offering services or certain functionalities. For example, we save a cookie to save your language selection for our website. This means that you only have to change the language once.
These types of cookies cannot be deactivated, otherwise certain functionalities will no longer work. In case cookies are deactivated in your browser generally, you will not be able to use all of our functionalities either.
We use Google Analytics and Google reCAPTCHA. These services allow Google to track our users. We allow our users however, to integrate these services only after explicit consent. In the case of Google reCAPTCHA, consent is even mandatory in order to to contact us via our contact form or to leave a comment elsewhere (e.g. for a tutorial).
As already mentioned, we ourselves don't track our visitors. The only user data we have is what you offer us when getting in touch with us, i.e. by using the contact form or by leaving a comment for any of our tutorials. In case you want to have your email address deleted from our database contact us and we'll process your request. In fact, we don't and we would never sell any user data to others!