Where to find details about champion stats and effects of star level?

I can find lists of champion stats (not sure how they were sourced), e.g., https://rankedboost.com/league-of-legends/teamfight-tactics/champion-stats/ and https://leagueoflegends.fandom.com/wiki/Teamfight_Tactics:Champions#Stat%20List (Does anyone know where they got this data?) However, it only shows the health increase across star levels. How does increasing star level affect attack speed, attack damage, etc? Does it just double/triple the base attack damage when the champ is 2/3 stars? Anyone know where to find that info?
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