Dota 2 Items and Timings
Itemization is a counter-pick. Six damage items on a hero that needs BKB is a shopping list, not a build.
Build for the game
If they have three stuns, BKB or a status-resist item is the damage item. If they have a lot of physical, armor. If they have invis, detection on a support is the item you 'forgot.' Guide builds are a start. The enemy draft is the real guide.
Timings
An item is a timer. Battle Fury, Radiance, Blink, BKB — tell the team when it completes so they do not 4v5 for 90 seconds. When it completes, take a tower or Roshan. Farming a second jungle item immediately is how games stall.
Lane items
Sticks, bracers, wraith bands, and regen win the first six minutes. Skipping them for a fast core is how you feed and delay the core anyway. Quelling Blade is not optional on most melee cores.
Support gold
Boots, wand, a save or a Mek. Neutral items are extra. You do not need six slots. You need to be on the map with a TP.
Buyback
After the first big item, cores should think about buyback gold before a risky fight. Dying with no buyback on high ground is the classic throw. Supports buy back if a rax is actually falling — not for a river bounty.