Private Keys in my Bitcoin Wallet? What are 'Private Keys'? and where do i find them in my wallet? How do I know it is a private key?
Depends on your wallet.

A Bitcoin private key is a 256bit (32bytes) random number (there is a max limit, but lets don't go into the details).
Often, wallets export them as a WIF encoded base58check string which looks like L1esWYsDL8nBeTRmGjUiDru54nXS4wF811n3e7mbvoSjM2zZWJ6w.

Sometimes, wallet use HD (look up BIP32 if you are interested).
Then the root private key starts with "xprv" and look like xprv9s21ZrQH143K4bhMhuUKZnW9DW5Dx9mwGQseMNdoECsaCGdhL9N8jR6KG5c3UTYrKPTkRNEBfeX7LjE2VjScyLZYA3XqRpyYbhnZHnsUepS

Search after "export private key" or "dump wallet", etc.