PSA About Counter Building
(Got a forum ban and my post removed for talking about counter building, also deleted the old one due to the spam bot downvoting last week.)
So here goes again. A PSA for newer and up and coming players trying to climb. The concept of counter building is super important. It's what allows you to circumvent or otherwise get around your enemy's strengths through items. Examples include, but are not limited to;

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Damage over time and abilities that have multiple hits of magic damage will ne cut by 20% with Helm, most burst magic damage will be mitigated by Hexdrinker allowing you to live, Banshee's will hopefully avoid those pesky set up cc's from Gunblade and other things.

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Anyone with Lifesteal, Regen, or Spellvamp like the above will be heavily hampered in their ability to duel thanks to Grievous Wounds. The first two items especially are incredibly gold efficient and can be sat on for most of the game before they need upgrading.
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Big thicc bois that stack HP or a certain resistance (Armor/Magic Resist) need a counter measure. Get around their defenses with the above items.
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Best counter to instant damage provided by mages and assassins is a shield or cheese mechanic of some kind. Their full combos are fast but not uncounterable. Survive the initial combo, and turn on them while they wait for their cool downs.
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With champions that rely on attack speed, critical hits, or both in the case of many top adc's, running Omen or Frozen cuts their damage per second by a percentage. Tabi is also a flat 10% reduction to auto attacks, which is not at all insignificant as the game scales.

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Hard cc setups can really screw you over. These items will break most hard cc allowing you to move freely and avoid an otherwise guaranteed death.
There are of course countless situations within game that require difference approaches, but these are some of the more common ones I see people rage and get frustrated at having to fight when there is always an item that could improve their situation and maybe turn the tide in their favor. Thank you and have a good day.