Pre-season ranked games weight?

So I'm not entirely sure how it works. I've heard that playing ranked games during pre-season does not matter while others say it does. I thought it did matter and for example if I went from silver to platinum during pre-season, that would mean that in the next season it would be easier for me to get placed in platinum or gold based upon how well i did in my placemement matches. So, how does it work?
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