Cardano Stake Pool Explainer

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Can I ask a general question about the theory of staking and pools? I saw something about 2% stake per slot (sorry if I’m munging details, hence questions), does that imply 50 slots and does this scale and/or relate to whether sharding is already in the nodes, etc.?

I’m trying to get a good high level picture of the POS architecture. The idea of “staking” and pools is more or less a proxy mechanism for POS “mining”. In systems arch. terms, the transaction costs are (in theory at least) regulated by the treasury governance processes, and can be raised or lowered to enhance sustainability.

Is this a good way to think about this stuff or is there some background I missed?