This page of The Last of Us game guide contains information on where to find the training manuals and tools in the Bill's Town chapter. Those items are collectibles-secrets. Our walkthrough indicates the exact location of each artifact and pendant.
Blades Manual 1
Description: Increases the durability of blades.
You can find it in Bill's hideout.
It is on the counter to the right.
They are on one of the shelves in Bill's weapon stash.