I wish to have more recommendation or articles to read concerning wallets and it's security values but during my research I was recommended to use electrum wallet but I was confused if electrum wallet is an exchange or a custodial wallet, therefore i need a good direction, clarification and update of suitable wallet from senior colleagues.
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 reviews by many people, you can be sure that it's secure enough.
Note that if you want to be complete security, you should run electrum on an airgapped device. Any online device is always prone to hacking.