Lately I keep hearing people talk about block builders, bundles, making it seem like if you don't understand, you'll get "eaten" on the chain. I think retail investors only need to know these few points: the transaction you send out may not be confirmed in the order you specify; someone might bundle a series of transactions into a block and, in the process, take the profit they can squeeze out; there are only two things you can do—don't chase confirmations during congestion, and don't use overly "direct" routes for sensitive operations. To put it simply, a bundle is like carpooling a taxi or passing notes in a dark alley—you don't need to know how to drive, but you should know you're not the only one in the car. Recently, with cross-chain bridges being hacked and oracle prices going haywire, everyone is shouting "wait for confirmation," which is basically admitting: on-chain, it's not a lack of knowledge, but a lack of patience and boundary awareness. That's enough for now—don't see yourself as a professional player.