If you want to learn a champion, have a little courtesy....
and please play at least one game of bots with them before you take it into normals. The necessity varies a bit by champion, but if you wanna learn someone with a decently high skill floor (i.e, useless until you've played a few games like Yasuo or Azir) please don't drag down 4 other people as you go 0-9 in lane trying to figure out what their skills do.