I'm trying to open much more than playing support, so I would like some tips on 
. I don't know where to get the good builds from and I'm not sure which site is trustworthy. Also, I haven't seen an Ahri mid in a while so is she like bad now as a champion? I'm really not sure what to do especially with me being mostly a passive player, not really going that deep for the kill.
Ahri is basically a mage with mobility. She has an average amount of AP damage output, high mobility, a hard CC and a sustain, and is fragile. She's solid all game long, but best midgame. If she get's ahead early she can become a monster midgame and carry a team. She's notable for being a pick that works in almost all situations.
Ahri's biggest weaknesses are the short range on some her spells and that most of her mobility is tied up in her ultimate, which has a cooldown. She is also skillshot based, but accuracy in skillshots is less important than having good judgement on when its safe to get close to an enemy for a kill. That's really only something experience will teach you.
At laning phase, she primarily wants to throw her Q and run, occasionally targeting the creeps when her passive is up. Ahri has reasonable harass, mobility, and sustain, and depending on matchup will leverage these to win her lane. I don't find her big on getting kills in a lane myself, not unless the enemy is foolish and leaves their tower with less than half their hp, so usually focus on cs, not getting ganked, and pressuring your opponent out of cs. I don't tend to gank before 6 either.
Midgame she can roam and apply gank pressure. She can also push fairly safely so long as her ultimate is up. Ahri's damage is particularly high at around this point so if you're doing fine you can quite aggressive. Do not be vulnerable when your ultimate is on cooldown.
Lategame she plays Bait and APC. In a teamfight she prefers to be a backline APC that dodges divers with her mobility, or cleans up a teamfight with it. She can also bait very well, as she is a preferred target but also slippery. You can win games against enemies who chase foxes.
For getting the most out of her skills, you can use Q as your typical workhorse, but save Charm until near certain it will hit. It has a much longer cast time and cooldown, and people will try to bait it out of you if they can. You don't need to hit an enemy with it to hit them with Q and W, even if it feels nice to combo. Once you activate her R, know that you don't need to hit the button again immediately. You usually don't need to burn all 3 dashes at once, unless you're doing so to do as much damage as quickly as possible. Finally remember they ARE dashes - flash is faster. That can save your life.
For building her, she can make most mage items work for her. My own standard build is:
21/9/0 (since the meditation change, I gave up on 21/0/9 and built double Doran's instead)
Armor seals, MR glyphs, Mpen marks, AP Quints
Start: 
2x
First back at 1350g: 
1600g: 
, if pressured before then head for 
, if you don't have them
or 
Note that your w counts as single target for Rylai's. The most common adaptions are to swap for 
, against certain AP damage dealers and point and click stunners such as Annie. and 
together can be used against tank heavy teams with guys like Cho'gath and Mundo. Against particularly squishy damage focused enemies I sometimes get GA before Deathcap. Zhonya's can be swapped in against certain enemies as well, but I tend to find GA does the job of being the defensive item better.
keep playing this game, you're not asking right things yet. You will soon.
Ahri is a strong pick still. Maybe people don't play her because her most important spells are skill shots which they can't land and her difficulty and mechanics are pretty high. If you don't want to go in deep that's fine too as she can flash three times!
Ahri is super top tier and my favorite or second favorite mid right now.
Runes: 3x AP Quint 9x Mpen Marks 9x Scaling Health seals 9x Scaling AP glyphs (these are important because they help you 1 shot caster minions with your Q at most stages of the game due to them ramping up in strength around the time minions get health bonuses).
**Build: **
early on for mana sustain and health/ap. Mostly for mana regen.
Full build:
Last Item is usually defensive oriented. I recommend:
depending on the enemy team comp.
If you're laning against a Zed or Talon you should rush Zhonyas, obviously. If you're against a Leblanc then 
is not a bad idea.
In lane you don't really have any bad matchups. There are some that will be more difficult than others (ex: Leblanc) but if you play well you can still win.
Lane strategy: You basically want to use your Q to either shove the wave or harass your opponent through the wave. Trade with auto attacks if you have a minion advantage. Hold onto your charm early on, it's really expensive for mana cost and you'll want it off cooldown if your opponent decides to all in you or the enemy jungler shows up. Only reason to throw it out is if you think you can get a kill off of your charm + ignite combo. Save your W for all ins or last hitting minions under tower. It's pretty weak until you put some points into it.
Early-Mid Game: Once you've hit 6 you should start looking for roams or a solo kill in lane.
*If you don't think you can kill your opponent, look for a roam towards bot lane. They should be level 4 or 5 when you hit 6 and if you have codex + double dorans or morellonomicon finished then you should be able to get a kill or two very easily if they're pushed to river and your botlane follows up.
Mid-Late Game: Try to setup picks. You should have upgraded your trinket ward around level 9, so use your free wards to set up areas on the contested side of the river. Ahri has very big kill potential if someone facechecks a bush that she's standing in, so if you see squishies floating around camp a bush and try to get an easy charm. If your ult is up and you land your charm then the kill is basically guaranteed. Fog of war is your friend. With charm you have huge pick potential and it's easy to land if your opponent can't see you.
For teamfighting you should stay with your team for the most part. Your abilities can hit through tanky frontliners and reach the enemy backline, so just keep with your ADC and use your charm for peel for the most part. If you and the ADC can quickly whittle down their tank between your true damage and their sustained damage, it makes cleaning up easy especially if you were able to hold onto your ult. Alternatively, try to get a flank and charm combo one of their carries out of the fight before it starts. It's generally better to do this before grouping/fighting starts however. Even though you're slippery and hard to catch, it's better if you're using your ult to chase rather than escape from a failed flank.
She is a popular champ, so if you haven't seen much of her is probably she's been banned or people are going for the more popular, way overloaded Ekko. I go for Mobafire if I need help with a build and find the most voted one, but I usually don't follow them to a T as they can be untrustworthy. It's best to follow a recommended build and try out certain items to figure out what you like best.
