Recently, many people are talking about blockchain builders and bundles, making it seem like retail investors who don't understand will be "eaten."

I think knowing what level is enough: frankly, you don't need to study how they piece together blocks, but you should know that what you send out may not be added to the chain in the order you expect, especially for large swaps, front-running mints, etc.
Others might bundle everything together and insert it all at once, and the "failures/slippage weirdness/transactions that seem to be sent first but execute later" you see are often caused by this.

What I care about most is on the wallet side: don't sign recklessly, don't give unlimited approvals, if a transaction gets stuck, first check the nonce, don't just spam re-sends and send yourself into a "duplicate/replacement" hell...
Anyway, getting these basics right is more useful than obsessing over builder names every day.

Additionally, I’ve been observing recent opinions that explain everything with ETF fund flows and US stock market risk appetite, and I envy those who can explain market moves in one sentence.
I can't do that—I just focus on signature details and transaction order; I’m too much of a homebody.
That’s all for now.