This is perhaps to long to explain all here, @clicked
Go and learn yourself ( and be more confidant that way) :
https://www.proofofkeys.com/

Woudn't be much happy reading. Here is video:

This maybe also useful
https://cryptocurrencyaus.com/a-simple-guide-for-storing-cryptocurrencies-safely/

And this , if you can't live without daily trading:
https://blocknet.co/proof-of-keys-event-january-3/

For those who think they are beginners:
https://www.cryptostache.com/2018/12/19/not-your-private-keys-not-your-bitcoin-beginners-guide-to-private-keys/