Cryptographic wallet is secured at its basic form because it has private keys that you should always keep it away from cyber criminals around. If you fail to protect these keys, then you are just revealing your wallet to these criminals and allow them to loot whatever you have in there.

It's very simple: to find out that you are a user or owner of bitcoin or other cryptocurrencies, you can simply contact your provider and ask for a printout of the resources you visit. Next is the matter of technology. Over passwords will not be there, but that's where you come in you will find very easily and quickly.

If you keep your bitcoins for a long time somewhere in cold storage, hardly anyone will know about them. However, if you go with them to exchanges and exchangers, while registering and leaving your information, then there is no question of anonymity here. It should be taken into account that bitcoin is only relatively anonymous and if you will simply carry out trading activities, even without leaving your data openly anywhere, then the secret services will be able to easily calculate you if you so desire.

no one will know unless you tell them your public key  but other than than that i cant of any idea to know the identity of some just looking at public keys, bcoz theres a lot of public keys on the ledger.

If you don't talk about it with anyone and if you hold your bitcoin on cold storage then i believe no one will know that you own bitcoin. It is different if you install some crypto app on your phone or notebook and other people see it, they can guess that you own bitcoin although they won't know how much you have.

Yes, it is hard to know that you have own bitcoin because blockchain is a decentralized system and no third party knows you have that kind of transaction, even if someone intentionally search but still they don't know the person behind the wallet address.

If you use several wallets, then no one will know, you need a wallet for storage that is not highlighted and is used only for storage, but for other transactions. Can open only when the exchange where it is necessary to provide documents.

No, if you hide it and in that case you must need to use good wallets and if the price is big then you should you several wallets and finally if you want to hide then you can.

That's right wallet address can be seen but to reveal the real owner is not possible not unless the user itself declares his identity, that's one of those reasons why many people support and use the chain, they wanted to hide their money inside btc and aimed for long term hold and continue to invest without a trace coming from other people.