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A few questions 

1) how are tick spaces determined when deploying a pool? 
Is there a sort of common number thats just fine for most cases? 

2) i understand that the price shifts whenever y / x moves in the tick range. 
But different pools across all of defi have different ratios. How do

devrel / solutions engineer & independent researcher

The tick spacing is determined by the fees charged in the pool for swaps, actually. Fees is represented in basis points (0.01% increments). (fees / 200) = tick spacing (or, tick spacing * 200 = fees)

So for a pool which wants 0.3% fees = 3000 bps, tick spacing = 15

haardik.dev | Founder @learnweb3 | lead instructor /uniswaphooks | building @openfarcaster

one edge case here btw is pools with hooks attached that enable dynamic fees

using dynamic fees will make tickSpacing = 60 (subject to change until code freeze happens, but as of right now this is it)

higher fees are generally on less-traded token pairs (to provide some security to LPs in such pools), with highly-traded pairs having low fees 

highly traded pairs also need small tick spacing to have more granularity in their pricing, and vice-versa

as such a correlation is devised between fees and tick spacing

Ok this feels a little counter intuitive actually. I'm guessing that the fees on the pool affect the tick spacing because you want to optimize for just how much value lps are extracting on swaps?