Synergy, Picks, Counter-picks. Help me out!

Hello there, So I'm a support main and in my games I have recently been trying to either counter pick the enemy support or pick a champion who I think synergizes well with my ADC or team in general. I'm using this site called to get the info I need but is this a reliable source? Are there better sources? And do you have any tips for me regarding these topics? Help me out. Much love and thanks in advance!
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