some said its non custodial wallet that is more good for someone to keep the bitcoin so that the person will not have a missing coin for his wallet
Using a self custodial wallet does not automatically mean that your funds are safe, and it is worth mentioning that there are so many self custodial wallets that are not recommended, for example: Trust wallet or Atomic wallet, asides from being self custodial, you should make sure your wallet has an open source code.
because I do hear that some people do misplaced their bitcoin in the wallet and I began to think how possible its for someone to loss he or her bitcoin in her wallet, maybe some of the wallet lacks a security and that is why many people do recommend a wallet that you can not penetrate to its security,
There is no 100% security, your funds will be better secured if you have good opsec and store it in a safe enviroment. If you use a recommended wallet online or in an unsafe enviroment, your funds in it is still prone to hacking.