The best tool to protect data is cryptography.
Knowing crypt tools available & when to use them will serve you a lifetime.
click book for
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Addison-Wesley
Learning Crypto Tools
and DES (previous standard)
for message, file & folder encryption –and
4 computerized preComputer 
methods for message encryption.
Key Store (aka keychain,
keyring) One key protects many keys.
creation & storage under your control because anyone that...
makes or shares your keys→ can use your keys.
Crypto fingerPrinter to authenticate your data
Logon–Password Manager stores
web logon & password data
Help & 
links in each tool
like:
videos 
chapters 
hands-on puzzles 