I do not collect personal data.
All websites, including this one, collect and log basic information about their visitors. This information includes IP addresses, timestamps, referring websites and user agents. The daily logs are generated, rotated and discarded automatically by the web server software after two weeks.
I use Google AdSense for display advertising. The AdSense website interface gives me the option to use personalized advertising and I choose not to use that option. No visitors receive personalized advertising.