Just reviewed a pretty stupid trade: I was trying to catch a small wave, but the slippage completely knocked me out. Basically, I was only looking at the "quote looks cheap," without checking the depth; the pool was so thin it was like paper, and I impulsively placed a market order all at once. The trade was split into several parts, getting more expensive each time, and in the end, the fees plus slippage stacked up, so I didn't see any profit, and my mindset took a hit first.

Thinking back, the timing of placing orders is actually more important than I thought: better to split into several smaller trades, test the waters first, see if the price drifts, and then decide whether to add more; or just set limit orders, and if they don’t fill, then forget it. Another lesson is "if you don’t understand it, don’t move"—a couple of days ago, I saw a new pool with all kinds of strange parameters (even involving NFT royalties, where creators want income, but secondary sales complain about low liquidity), I felt something was off right away and held back from trading. Later, I saw the prices flying all over the place… Anyway, this was a tuition fee paid to myself.