the main issue is who owns your private keys and how safe the keys are. Think about it like keys to your personal safe. the concept at a high level is monetary sovereignty. The private key is used to access the coins that are associated to to a public address. so whoever has the private key of the address above, has a lot of coins!
As an individual, most likely you would want to buy a hard wallet such as a trezor (trezor.io) so that this device can store your key safely store your keys and therefore your coins.
trezor.io ..?
I've heard it, thanks for your suggestion and enlightenment,,
I will try your notice and learn more.
definately worth you looking into.
https://shop.trezor.io/?h=7472657a6f722e696f
https://blog.trezor.io/?gi=69cd98cf9857
you can also look into nano ledger
https://www.ledgerwallet.com/products/ledger-nano-s