I believe that although it's a good idea, Riot is unlikely to be willing/able to do something like this very soon. Riot isn't going to stop changing the game, one of the reasons it stays popular and fun for most of us is that it's almost a new game every two weeks, and once or twice a year it changes substantially. In order to make guides or tutorials they would have to assign a fairly large team to maintaining them with every update. They are barely keeping up with updating the recommended item pages for each champion when something changes substantially. There are guides out there that are helpful, and as SoBE mentioned the good ones aren't always easy to find but you can always try more than one until you find something that works for you. There are also a lot of video's out there to help with basics.
In regard to the "new" AD items, I can give a quick rundown:
items that build off of Zeal: (All Zeal items increase attack speed, crit, and movement speed, the exact amounts vary by item)
RFC (Rapid Firecannon): This zeal item builds up a charge, when fully charged it increases your max attack range for a single attack, this attack also does bonus damage. RFC in my opinion is somewhat over rated. But there are times when that extra range can be exactly what you need.
Statikk Shiv: This zeal item builds up a charge like RFC, but it doesn't affect your attack range. When Statikk Shiv reaches full charge it releases a burst of AOE damage. This AOE damage can crit, and does extra damage to minions. Shiv is the best zeal item for AD champs that need extra wave clear.
Runaan's Hurricane: (ranged only!) Causes your auto attacks to also hit two additional targets for 25% of your base damage, effectively increasing your auto attack damage by 50%. This Zeal item is intended to provide maximum aoe damage during team fights, it is most effective on champions that have an "on hit" effect like Kog'maw with w active, Ashe with Ranger's focus active, kindred with... stacks, Jinx with rockets active, it will apply poison from Twitch and Teemo.
PD (Phantom Dancer): This is the "dueling" Zeal item, it provides the most benefit in 1v1 scenarios, it provides the least movement speed of all the zeal items except when close (550 range) to an enemy at which point it provides the most movement speed of all the zeal items, it also makes you take 15% less damage from the last person you auto attacked.
Blood thirster still provides the most life steal.
Infinity edge still provides increased crit damage.
Death's Dance provides 15% health back on physical damage, and converts 15% of incoming damage into damage over time. It's an interesting item but I only use it in certain cases.
Essence Reaver is the main item to build for CDR and mana regen for AD champions, it gives crit, and requires building more crit to reach full potential, so it's mostly good on champions that are going to build IE (if you're going to build crit, might as well make the most of it) and at least one Zeal item.
Blade of the Ruined King hasn't really changed much, it still helps against champions who stack a lot of health.
The newest AD item is Duskblade of Draktharr, it's intended for assassins, but it provides a good amount of AD and flat armor pen, I will often build it instead of a last whisper item against a team with no real tanks.
Youmuu's Ghost blade also provides damage and flat armor pen, with 10% cdr and a nice attack speed and movement speed active with a fairly short cool down.
Black Cleaver is a good mix of offense and defense with stacking armor pen and 20% cdr, it's good if you want cdr on an AD champ but don't need crit. Or if you want a more defensive armor pen item.
I didn't think about just how much there is to cover. There's also Maw of Malmortius, Mortal Reminder and Lord Dominik's Regards
Maw provides some defense against being burst down by AP champions, plus AD and flat armor pen.
Lord Dominik's Regards (LDR) is the go to item to allow you to do damage to tanks.
Mortal Reminder builds off of Last Whisper and Executioner's Calling and is the item you want to counter insane life steal and healing (ie vlad/swain/soraka/aatrox)
I haven't even covered Trinity Force, Iceborn Gauntlet, sterak's gage, Frozen mallet, Ravenous Hydra, Titanic Hydra... but I've spent way too much time on this already, good luck, have fun!
trolls (playing on my team, putting walls in front of me when I am about to get a kill, putting a wall on me as I'm teleporting, etc.). I also wonder, when patch 6.14 comes out, will 
become a big threat to lower elo players? [slayer-jinx-catface] Ty for any answers guys!
, then something like
or 
for some damage
