Wallets and UTXO

Is every btc that is not moving an UTXO, until it moves ?

so it A transfers B that transfer C ( A -> B -> C ), is A-B a spent trasaction and B-C an unspent transaction ? (until C transfers again)

UTXOs are basically funds on any key that have not been “spent”. If there balance is 0, you have no UTXOs. If you have 0.1 BTC, you have 0.1 UTXOs.

So if B received 1 BTC from A and B send 0.5 BTC to C, then both have UTXOs