What should be installed on my computer?

1. Sentinel One (see installation in the green menu on the left)
2. Current system updates, especially Windows updates (see green menu on the left)

What should I pay attention to when working on the Internet?

1. Before filling out a form, make sure that the page is encrypted(https://...)
2. Check the main domain (especially the last two elements of the host name, e.g. https ://mail.uni-oldenburg.de/ , https ://kunden.commerzbank.de/lp/login. Suspicious here would be https ://mail.uni-oldenbug.de/ or https ://mail.uni-oldenburg.com/ or https ://kunden.comerzbank.com/lp/login
3. For links in the browser or in emails, move the mouse over the link(do not click on it!) and pay attention to the link destination displayed (in the bottom left window or in the pop-up display).