PSA: Know Your Role In Rank
With the new dynamic queue and the new champ select, there is absolutely no reason you should be playing a role you don't know how to play.
There is also absolutely no reason you should be playing ranked if you can't even play two roles. It is fairly simple to have a main role and a secondary one you can play decent.
If you DON'T know how to play a role, then don't put that role as one of your preferred two in the champ select queue, especially if that role is jungle or support. You are only setting yourself up for failure and severely handicapping your team. The amount of people I've seen come into the new champ select, get half way through a game, and then admit they don't really know how to jungle just blows my mind.
Seriously, if you aren't doing it for your team, do it for yourself; do NOT pick a role you have no clue how to play. What is the point when you don't have to? If you do happen to pick a role that is your secondary, then do yourself a favor and don't pick a champ you don't know how to play in that role <_<. There is nothing wrong with being a one-trick in your secondary role - but don't pick a champ you might have played once in a bot game in jungle, because you wanted top. Again, what is the point?
Thank You for reading, and please, queue up with your brain turned on.