Transfer Value and Cover Network Costs
You can send native TRX directly between compatible accounts. Transfers consume Bandwidth; smart-contract operations, including TRC-20 transfers, also consume Energy. If the required resources are unavailable, a transaction can require a payment from your TRX balance.
Do not spend your entire available balance simply because a wallet displays a small fee for one operation. Your next action may involve a different transaction type and a different resource requirement.
If you hold bitcoin and need native coins for these operations, compare the net payout on BTC to TRX exchange. Receiving that payout is an asset conversion; sending a balance you already own is a transfer.