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 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.
Other non-custodial wallets including Electrum only allow the customer to have full control of their funds but also do not guarantee 100% fund security to anyone. But yes it is quite a strong wallet and there are very few complaints from users and it is also not seen to be hacked. However, besides this wallet, you have to be careful especially from different types of phishing links. Because a phishing link is so dangerous that even a strong security system can destroy it and gain access to it