It's a bit annoying to be stuck in traffic on the way home from work today, and the coffee in the car has gone cold... I casually checked the blockchain, and recently I've seen quite a few people talking about block builders and bundles, as if it's some kind of mysticism.

I personally think retail investors only need to understand this much: your submitted transactions don't necessarily get included in blocks in "chronological order"; they might be bundled together into a "bundle" and sent through a "more expensive and stable" channel; so don't always obsess over why, even when you click quickly, you get high slippage, or why sometimes the same transaction results differently on different frontends. The approach is quite simple: for important operations, try to use reliable wallets/frontends, don't chase after slippage, don't rush during congestion, understand the on-chain interaction costs upfront, and if you really need to race against time, accept paying a higher fee.

Lately, I've also seen explanations that use ETF fund flows and U.S. stock market risk appetite to interpret crypto price movements, but after seeing it many times, I find it a bit superficial... macro factors can be considered, but for your individual transaction, it mostly comes down to execution details and the current "traffic conditions" on the chain. Anyway, I prefer to follow the map and avoid gambling on luck.