Solo Queue Pregame Protip: Choose your secondary based on your primary
Are you a supp or adc main? Learn the other one for your secondary. Mid or top main? Learn to jg for your secondary. Jg main? Learn mid, specifically champs who can roam well.
Here's why: Any time you get your secondary, the person who got your primary likely put that role as their primary.
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If you queue supp/adc and you get adc, you know your support probably mains the role; you're gonna have a good lane.
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If you queue top/jg and you get jg, camp top. You know they're probably a top lane main, and -- as importantly -- you know how top lane is played.
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If you queue jg/mid and get mid, your jg probably knows what they're doing. Pick a roaming champ and join them for ganks to amplify their effectiveness.
Certainly, mains have bad days like anyone else. But overall, you're making it so the summoners you'll be seeing the most in game have a higher chance to know what they're doing.