Guys, How to keep my wallet safe?
Where can I buy cold wallets or what kind of services do you use?
Personally, a hardware wallet such as the ledger nano (s) or the trezor series is the best and most secure option for holding and storing your bitcoins. You may also try electrum wallet, however that is a software wallet and is prone to breakdowns if your computer crashes or dies.
However, please be in control of your private keys the whole time, and also make sure that you are keeping no funds in exchanges, as they can scam you whenever they want.
Also, don't be stupid. Do not open shady links or expose your private keys. This way, you will be fine (for sure?).