Don't confuse 'Core Items' with best possible item purchases. Actual core items are only Spellthief's Edge, Sightstone, Mobility Boots, Vision Ward and Sweeping Lens.

You cannot max an ability at level eight. Check your ability sequence once again!

A general touch on warding is helpful and you can't go wrong with it in a support guide. Just throw in a picture with common and maybe even underestimated but rewarding warding spots.

Maybe you should clarify that building Frostfang immediately is gold inefficient. Many people tend to equip Frostfang early on but building an item such as Mikael's Blessing after finishing your core items is more reliable.