Since the points of attack are many and varied, there is not one general guide on how to protect yourself from a cyber attack. One vulnerability is the behavior of the employed persons who have access to the data of your company/institution. Therefore, employee training and associated awareness can be very helpful.
If your web application is an important part of your corporate strategy, we recommend a Web Application Pentest.
To protect your data in internal or external networks or clouds, various network security checks are listed here. Simulated attacks can also be helpful. You can find out more about this service at Red Team Assesment.
Of course, our specialists will also help you choose the most useful security check for you.