Many of them said to keep Bitcoin in Binance Account, Ku Coin Account, Trust Wallet.Now my question is if I keep my bitcoins in these wallets will I be able to use them whenever I want and will it be safe.
Binance and KuCoin are exchanges and are centralised for that matter, keeping your assets in them is very risky. But Trust wallet is a good one for it's a non-custodial wallet with an open source.
Are there other wallets where bitcoins are most secure?
I want your opinion.
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My candid opinion is for you to find non-custodial wallets with an open source, you may Google it and find lots of them. Also, DYOR on the ones you want to use eventually. But nothing is 100% secure on the internet, hacking could happen to the supposedly secured ones and your keeping of your wallets matters so much.
Nevertheless, it's arguably better if you can use the hardware wallet, its arrangement keeps it less porous to the internet. However, you would have to part ways with some costs and have to have a reasonable amount to store before this can be an economically good option for you.