This world is still full enough with foolish people who never try to understand risk and always put things in places where they always have a chance of loss or theft despite the danger of life being ruined, and they will never be able to recover this after once lost. I learned the first lesson: not your keys, not your coins, because there are many stories where people lost them due to just not taking precautions.
Never trust any online store or place with your privacy because they always have flaws, and this could always have a chance of giving you losses. Always keep your things under your own control. Securing things offline is always recommended because this gives a better way of security, and also use different methods because risking only one is also problematic. Having a duplicate system will increase security.
When a person becomes aware of himself, he can protect himself from big losses. There are still many people who do not become aware until the loss occurs, when they actually phrase a big loss, as a result of which they adopt awareness which is not right at all. We have to keep our own money or wealth under our control, for this it is very important to take all the awareness we need in advance.
One thing we say repeatedly is that to keep Bitcoin safe, it is very important to always store the seed phrase, private key and passphrase in a safe place because if you lose these keys or share them with someone, you will lose all your assets or coins which you will never get back, so it is very important to store them in a safe place with awareness, as you said not your keys, not your coins. However, many people store them online for extra security, which is not right at all, it is very important for us to keep them under our own supervision.