Recently, some people have been scaring retail investors with "block builders, bundles," saying if you don't understand, just wait to be harvested... Honestly, you don't need to memorize those flowcharts. How much do you need to know? Enough to not be naive when interacting on the chain: your transaction isn't processed in the order you click, others can bundle, front-run, or sandwich you, especially when you're still gambling in the public pool. AI agents are now being hyped up, automatic trading is taking off, and the narrative sounds appealing, but when it comes to security, many people are really penny-wise and pound-foolish: private keys, authorization, slippage, MEV protection—if you don't check, you're basically running naked. Anyway, in perpetual markets, I only trust two things: funding rates and human nature. Human nature will always bite you the moment you think you're "really smart."