What Are Support and Resistance Levels in Crypto Trading?

Support and resistance levels in crypto trading are the prices a chart keeps bouncing off. Support is a price where buyers have repeatedly shown up and stopped a fall. Resistance is a price where sellers have repeatedly shown up and stopped a rally. They are not predictions, and nothing forces the market to respect them - they are a record of where people have acted before.
Why does price stop at the same places?
Because people remember prices. Think of a shop where a jacket has sat at $200 for months: shoppers come to treat $200 as the normal price, and anything under it feels like a deal. A chart behaves the same way. If Bitcoin bounced hard from around $93,000 twice, a crowd of traders now has orders waiting there, and everyone who sold too early is hoping for a third chance to buy. Those waiting orders are what makes the level real.
What does it look like on a chart?
Flat stretches and repeated turns. Open Ethereum on any free charting tool and you will see prices where the candles have long wicks pointing down, as if the market tried to go lower and was pushed back. Line those wicks up and you have support. Do the same with the tops of failed rallies and you have resistance. The more often price has turned at a band, and the more recent those turns, the more attention it gets.
What happens when one gives way?
They swap jobs. Broken resistance often becomes support, and broken support often becomes resistance, because the crowd's opinion of that price has flipped. This is why traders watch the retest after a break more closely than the break itself.
Start by reading levels rather than trading them. Mark two or three on Bitcoin, leave them untouched for a fortnight, and simply notice what price does when it arrives. That will teach you more than any indicator you can add to the chart. Next: how to find these levels yourself and how to use them in a trade.