What Are Gas Fees?

Calls to the blockchain are essential when dealing with NFTs. These calls require heavy processing power and energy, thus they incur a gas fee to compensate.
What actions require gas fees?
Any action that involves sending a transaction to the Binance Smart Chain will incur a gas fee. Here is a list of such actions:
Buying a fixed price sale
Creating a fixed price sale
Cancelling a fixed price sale
Bidding on an auction
Creating an auction
Creating a collection
Minting an NFT
Accepting a bid after an auction ends
For more details on each of these actions, please visit their individual page in the guide.
Who pays the gas fees when someone buys my NFT?
When someone buys your NFT, they will be interacting with the Binance Smart Chain and pay gas fees in BNB. 
BNB (BEP-20) is the native token on the Binance Smart Chain, so make sure you have BNB in your wallet as well in case you want to buy NFT from other creators on the market.
In the case of an NFT buyer, they will have to take into account the gas fees as well as the NFT artwork price before buying it.
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Reminder:
Before sending the request on the block chain, you will be asked to Confirm on your wallet, and an Estimated gas fee will be provided at this stage.  You are recommended to maintain the BNB balance in your wallet to be at least 50% more than the estimated fee. This would prevent the chance of transaction failed due to run out of gas fee.  For example, if the estimated gas fee is BNB0.001, you are recommended to have at least BNB0.0015 in the wallet at the point when you confirm the transaction.

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Gas Fee and Other Fees

What Fees Do I Pay For Minting, Listing, and Creating a Collection?

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What actions require gas fees?

Who pays the gas fees when someone buys my NFT?