Today I saw someone on-chain talking about block builders, bundles, and such again.

At first, I also wanted to understand everything thoroughly, but then I realized retail investors just need to know what's "good enough"...
Honestly, when you place an order, it doesn't go directly into a block; someone is packaging transactions in between.
Others can bundle a bunch of transactions together and insert them, so your order might get front-run or sniped, especially for someone like me who impulsively chases price jumps—it's spicy.

Right now, I only remember three things:
Don't rush into the public mempool recklessly (use private/protected ones if possible),
Don't aggressively attack pools with low liquidity, and don't open slippage settings blindly.
AI agents and automated trading have been hyped up quite a bit lately, but I care more about how they sign transactions and how much permission they have...
Some people talk about narratives to the point of excess, but they gloss over security details, which just makes me tired to watch.

I'm tired but still here, anyway I don't want to keep paying tuition to MEV for a single emotional trade.