I would suggest buying some BNB (Binance coin). Binance is great, but for one annoying thing.
You can’t sell or buy partial coins. For example, you buy 10 coins (and you don’t own any BNB) after the deduction of trading fees, you’ll have 9,34556 coins. However, you can only sell 9 coins. Binance doesn’t accept the selling of the decimals. If you have BNB your trading fees are paid with BNB. Same example, you buy 10 coins. After deduction of trading fees (paid in BNB) you still have 10 coins. Hope this was clear.