The first page of my trading journal says: Understand it before you place an order.
This lesson's topic: hash functions
It's nearly impossible to recover the original input from the hash of a secure hash function, and it's nearly impossible to find two different inputs with the same hash.
After downloading wallet software, you can check the official SHA-256 checksum to make sure the installation package hasn't been tampered with.
Mining with $BTC is essentially calculating SHA-256 hashes nonstop to find a result that meets the difficulty requirement. Current: 82239.66.

NFA (not financial advice). Do your own research.