Electrum is a non-custodial wallet which means that it gives you full access to your private keys. Since electrum is open-source and its code has been reviewed by many people, you can be sure that it's secure enough.
Note that if you want your fund to be completely secure, you should run electrum on an airgapped device. Any online device is always prone to hacking.
Electrum wallet is free, open source, non custodial and good to use. It has many 'modes' to use like single signature wallet, multi signature wallet, cold storage ...
Always download it from the official website :
https://electrum.org/#download and verify the wallet.
OP, when you use a non custodial wallet, always backup your wallet. Without backups, you will lose your bitcoin if your original device gets technical problems and can not be recovered.