With Steam Guard you can secure your Steam account even further. You can find all the information you need here..
The Steam Guard protects your Steam account with two-factor authentication. To do this, you have to download an app on your smartphone and log in there with your Steam access data. In the following tipps + tricks article, we will tell you more about the app and how you can use it optimally.
Steam offers a mobile phone companion. You can download this app for Android and iOS devices. For example, you can use the app to view your games in the library or chat with friends. You can also activate the Steam Guard there:
In addition to the obvious advantage of security, the Steam Guard also offers you even more bonuses: For example, users who have been using the authenticator for at least two weeks can make purchases and sales directly on the community market. For users without the app, transactions are withheld for two weeks. This is to prevent someone from taking unauthorized access to accounts and stealing large sums of money via the community market.