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
The one thing you need to carry your bitcoin securely is a set of twelve words which is called your seed. That seed has a bunch of addresses connected to it which you will always have access to if you keep those 12 words securely. (Not so secure that you fail to retrieve them when you want).
There are different options to generate those words. The most user-friendly and straightforward method is to buy a hardware wallet (from a reputable source, not from ebay resellers).
The next simpler method is to install Electrum wallet from a verified link on your PC and let it make a SegWit wallet for you. That will give you a set of words as well as a file called "wallet.dat" (or whatever you choose to name your wallet). This will have a password associated with it. Generate it on a PC without any malware and use the addresses to receive your funds.
Doing wallets is a bitch in the beginning but as you get practiced, it becomes a breeze and enjoyable. With bitcoin, you are your own bank. That comes with the responsibility to learn and secure yourself.