$BTC Liquidity in crypto markets is a key factor that many beginners overlook. It refers to how easy it is to buy or sell an asset without causing the price to move too much. A pair with high liquidity like BTC/USDT allows for trading large amounts with little slippage. In contrast, assets with low liquidity may have wider spreads and sharp movements. Liquidity is also related to the depth of the order book and the daily trading volume. To trade efficiently, always check the liquidity before opening a position, especially in altcoins.