Why swapping back does not restore the original amount
Use a controlled AMM example to distinguish reversible curve movement from the fees and state changes that make a real round trip lose value.
Explore the reference
DEX essentials — page 3
Start with what an aggregator does, what a quote means and how an on-chain trade settles.
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Why swaps and signed orders have deadlines
Understand validity deadlines for swap transactions and signed orders, and why an expiry is not a promise of timely execution.
Why the same token has liquidity in many places
Explain why one token pair can have several pools across venues, versions and fee tiers, and how that affects route discovery.
Why transaction value can be zero during a token swap
Explain why an ERC-20 swap can show zero native transaction value even while it transfers a substantial token balance.