Various cookies are created on your machine through the advertising. These cookies help the advertisers track you and target the most appropriate adverts at you. On pages with adverts you may initially be asked to provide consent; you can update your settings via the link in the footer on those pages.
This website itself collects no data about you. The Morse Code Trainer does have a form requesting your call-sign etc but that data is not used on any remote server. If you send a message to a friend from the Morse Code Translator then the message is recorded in a web server log file which is retained for 7 days.
I collect anonymous data regarding the use of the website via the "Matomo" software. I host this securely myself: this data is not sent to another company and no long-lived tracking cookies are used for this purpose.