The US Federal Reserve — the Fed — is the most powerful money authority on earth. Fed liquidity simply means how much money the Fed is adding to, or pulling out of, the financial system at any given moment.
When the Fed is adding money, there is more cash sloshing around looking for a home — and a good chunk of it ends up flowing into assets like shares and crypto, quietly lifting their prices. When the Fed drains money back out, the opposite happens: there is less to go round, and prices start to feel the squeeze.
Here is the part that makes it so valuable to watch: this money tide tends to move before crypto does. Looking back over history, big changes in Fed money have led Bitcoin by roughly two to three months. So instead of reacting to price, you can watch the tide and see the wave coming.