Le site electrum.org est-il sûr ?

Pretty good wallet, using it since years. But there are many scam copycat fake websites out there, make sure to use _only_ this domain to download the Electrum software, never from any other domains. (if your tech savy of course you can also get it from github, and bonus points if you verify gpg signatures to make sure everything is good.)

This is a great light weight alternative to the Bitcoin-QT. Does not require downloading the entire blockchain which saves lots of time and hard drive space. Able to recover it via a mnemonic if you lose your wallet encryption key. Keep the mnemonic offline if you can.