Understanding its Security and the Underlying System
It uses a system of decentralized trust-less verification based on some cryptographic functions. It uses a public ledger with a digital signature.
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Actually, no one can copy one of your signature and forge it. The signatures are verified using the public key. It is 256-bit signature and is completely infeasible to create a signature without knowing the secret key and only signed transactions are valid.
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that is maintained by decentralized nodes. Some of these nodes are called miners and responsible for adding new blocks to this blockchain.
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Mining requires to do a lot of work. Miners are actually listening to transactions, creating blocks, broadcasting those blocks, and getting rewarded with new money.