PCB Design Checklist

Start with a Simple requirements documents , a simple excel sheet will do ( google sheets with tiny url )
It should cover basic functional requirements ( these can later on be assessed with Verification and Testing )
Unless needed avoid expensive and unkown parts .
Confirm input supply , total power requiremenst , Layout for I/O and dimensions.

All new parts to be double checked for pinout
Create schematic in a frame with different sections broken out , if too big break in pages.
Component rating to be 1.5 the required ratings
Check active compoents for min and max voltages
Make sure engough capacitance is there on output of LDO / Buck
Do not forget decoupling caps

Make sure to have Date and Name for the project
Placement of components is 80% job done so most important
Place in a fixed grid , maing maching placement easy
Minimum 3 fiducials
Use JLC 4 layer as default setup
Are there any Current Resisor ( Make Sure size is correct ) and sections are isolated
Power traces please calculate accordingly
Unless going into a Enclosures , make sure to have mounting holes
Touchpad for all voltages ( small pads will do )
Use SMT unless no other options
Does anything themal management
- heatsink if Themal dissapation is high ( space for heatsink )
- Bottom vias hemal pad is there / large via
- If a pad has to transfer heat avoid themral erliedf around
High speed / Differential lines need impedance matching
- avoid vias on these lines
- provide solid plances under them
Cannot fulfill current in trace then remove solder mask for solder to increase current.
Avoid right turns and try to group similar signals