PCB layout and design

PCB layout and design has some basic rules, good practices and rules of thumb however it is a highly creative and individual process.

Methods
PCB layout design is possible with tape and dry transfers, or permanent marker pen however EDA software will offer schematic capture, PCB layout, ERC (electrical rule checks), DRC (design rule checks) and other features such as simulating the circuit with SPICE.

Social

 * PCB Design- Rules tips and tricks, Mod Wiggler Forum, Dec. 2015
 * SDIY PCB/schematic/code critique Facebook group
 * The layout factory, electro-music.com sub-forum

Standards

 * IPC-2221A Generic standard on printed board design

Design cycle

 * How can I go from prototype to commercial product, Electrical Engineering Stack Exchange
 * What is the schematic capture-PCB layout design cycle, Electrical Engineering Stack Exchange

Trace dimensioning

 * How to calculate PTH hole and pad diameter sizes according to IPC-7251, IPC-2222 and IPC-2221 standards?
 * PCB trace width calculator
 * How to gauge traces by Douglas Brooks
 * PCB trace reference

Utilities

 * GerberTools by ThisIsNotRocketScience, GitHub, tools to load/edit/create/panelize/prerender sets of gerber files.

Board house capabilities and guidelines
In the first instance refer to the capabilities and guidelines of the PCB manufacturer you will be using and set the design rules check (DRC) in your EDA suite to suit.
 * Design for Manufacturing, Seeed Studio
 * PCB capabilities, PCBWay
 * PCB capabilities, ALLPCB
 * Circuit design confirmation list, PCBCart
 * Design Guidelines, Eurocircuits, July 2014
 * Various guidelines and capabilities, Eurocircuits
 * Tips for designing PCBs, ExpressPCB - archived

Mixed-signal layout

 * Analog vs digital ground, about mixed signal pcb layout
 * Design considerations for mixed-signal PCB layout
 * Partitioning and layout of a mixed-signal PCB by Henry W. Oft, Printed Circuit Design' June 2001
 * PCB signal coupling can be a problem by Bonnie Baker, EDN, 17 Dec.

Videos

 * EEVblog #244 – How To Lay Out A PCB – PSU Design Part 9
 * 20 Key Takeaways from EEVBlog #1129