How-To: Build Redstone Circuits

Redstone circuits can be found several ways, but one of the most common is mining. Buttons will only provide a charge for a few seconds after being pushed.

Redstone Circuits, Minecraft Wiki

How to Send Redstone Signals Both Ways with This Two-Way Repeater

Redstone Logic Gates: Mastering the Fundamental Building Blocks

10 Minecraft Redstone Tricks for Survival Mode - dummies

Redstone circuits/Memory – Minecraft Wiki

Redstone Circuit Board SpigotMC - High Performance Minecraft

Ever wanted to build custom logic gates and complex redstone

How to Make a Secret Door in Minecraft

Redstone Circuit Index - The Minecraft Intelligence

How to Build Redstone Logic Gates