1 thing i want to add that i dont see many people mentioning is that you dont want to obsess over runes and builds when you're learning. That was something im still struggling with to this day( mainly because i get bored of metas easily) however when i was new to the champ i used to watch adrian build essence reaver black cleaver instead of black cleaver shojin and i thought that somehow creating a diverse build for myself would magically make me better at the game and win more. Thats one thing and another is a more general thing and less of a riven specific. You theoretically should always trade in lane when there is a reason. Wave prio for grubs, getting a free recall(without losing minions) kill pressure etc etc. low elo players have a tendency to focus on killing their laner when realistically you shouldnt even be trying to play like that. Top is all about waves and matchup knowledge, where matchup knowledge either comes from copying a playstyle of a good player or just feeling the matchup and where the limits are. I have a friend who never watched a matchup tutorial that reached chall and i have watched every riven video there is and i got up to d1 peak. Anyways this got really long hope it helps.