How can I ensure that my funds are kept safe?

At the protocol level, Fedimint leverages best-in-class security practices by federating custody across multiple guardians of a federation, replicating the benefits of multisig to eliminate single points of failure.

At the federation level, fund safety comes down to the individual guardians entrusted to collaboratively custody the resources of the federation by running and maintaining their fedimint servers.

You should therefore use federation wallets in proportion to your level of trust in the federation. There are several ways to establish trust, such as by knowing the guardians personally, leaning on the social proof of public federation ratings, relying on how long a federation has been running successfully, and more.