Usually the items (and order) are described in the guide. You need to understand the basic principles of building for AD or AP or Tank or Support. You have to experiment with different items, figuring out over time what helps your champion best.
Personal habitual activites? Utilizing gargantuan idioms to fabricate intelligence.
"It's a colloquial shorthand that means the paradigm exists because of how the game works mechanically. Hence, "the Meta." Stop being a useless pedant." - PlayGooYa
"It's a colloquial shorthand that means the paradigm exists because of how the game works mechanically. Hence, "the Meta." Stop being a useless pedant." - PlayGooYa
Read guides.
Watch streams.
Play games.
Learn all the items and all the champs.
Learning to build situationally comes with knowledge and experience.
Watch streams.
Play games.
Learn all the items and all the champs.
Learning to build situationally comes with knowledge and experience.

Thanks to The_Nameless_Bard for the sig!
play the game
Thanks to TRUeLM, Plastictree, Scrax, Xiaowiriamu, foggy12, JahGFX, jhoijhoi, msrobinson, JEFFY40HANDS, Nyoike, MissMaw, and me :) for the sigs!
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"Artillerymen believe the world consist of two types of people; other Artillerymen and targets."
- Unknown