Hello,
i don't know bitcoin very well but i have money in btc on coinbase. I am not sure have money on coinbase is very secure. What do you think about it ? Is there a way for have bitcoin with security because i scared coinbase block my account or give information on how much money i have on it, i think it is not very anonymous
Using a custodial wallet like coinbase is not the best wallet when it comes to security since they are not decentralized they could pretty much do anything to your investment, Just like what you said they could block your account or freeze your account at any moment.
If you really want to secure your bitcoin you should first choose a wallet that offers a private key to it like for example Electrum, Mycelium, etc. and then from that, you could use another layer of security to secure your wallet like hardware, 2FA authentication, etc.
Electrum:
https://bitcointalk.org/index.php?topic=5240594.0